How to use both MFRC522 and RDM6300 using a NODEMCU

I want to use both MFRC522 and RDM6300 readers on a single NodeMCU, the two separate codes for each readers are respectively :

/*
 * --------------------------------------------------------------------------------------------------------------------
 * Example sketch/program showing how to read data from a PICC to serial.
 * --------------------------------------------------------------------------------------------------------------------
 * This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
 * 
 * Example sketch/program showing how to read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID
 * Reader on the Arduino SPI interface.
 * 
 * When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE
 * then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When
 * you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output
 * will show the ID/UID, type and any data blocks it can read. Note: you may see "Timeout in communication" messages
 * when removing the PICC from reading distance too early.
 * 
 * If your reader supports it, this sketch/program will read all the PICCs presented (that is: multiple tag reading).
 * So if you stack two or more PICCs on top of each other and present them to the reader, it will first output all
 * details of the first and then the next PICC. Note that this may take some time as all data blocks are dumped, so
 * keep the PICCs at reading distance until complete.
 * 
 * @license Released into the public domain.
 * 
 * Typical pin layout used:
 * -----------------------------------------------------------------------------------------
 *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
 *             Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro
 * Signal      Pin          Pin           Pin       Pin        Pin              Pin
 * -----------------------------------------------------------------------------------------
 * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
 * SPI SS      SDA(SS)      10            53        D10        10               10
 * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
 * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
 * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
 */

#include <SPI.h>
#include <MFRC522.h>

constexpr uint8_t RST_PIN = D3;     // Configurable, see typical pin layout above
constexpr uint8_t SS_PIN = D4;     // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance

void setup() {
    Serial.begin(230400);       // Initialize serial communications with the PC
    while (!Serial);        // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
    SPI.begin();            // Init SPI bus
    mfrc522.PCD_Init();     // Init MFRC522
    delay(4);               // Optional delay. Some board do need more time after init to be ready, see Readme
    mfrc522.PCD_DumpVersionToSerial();  // Show details of PCD - MFRC522 Card Reader details
    Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
}

void loop() {
    // Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.
    if ( ! mfrc522.PICC_IsNewCardPresent()) {
        return;
    }

    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial()) {
        return;
    }

    // Dump debug info about the card; PICC_HaltA() is automatically called
    mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
}

and

/*
 * A simple example to interface with rdm6300 rfid reader using esp8266.
 * We use hardware uart "Serial" instead of the default software uart driver.
 *
 * Note:
 *     The esp8266 let us use 1.5 uarts:
 *     Serial=uart0=rx+tx, Serial1=uart1=tx only (rx pin is used as flash io).
 *     Here we sawp the uart pins so uart0_rx goes to the rdm6300_tx,
 *     and uart1_tx goes to what used to be uart0_tx-
 *     so debug message goes from Serial1.print(...) to the pc debug terminal.
 *     https://github.com/esp8266/Arduino/blob/master/doc/reference.rst#serial
 *
 * Connections:
 *     | esp8266 | nodemcu | rdm6300 | notes                               |
 *     |---------+---------+---------|-------------------------------------|
 *     | GPIO-01 | TX      |         | This is TXD0, connect it to GPIO-02 |
 *     | GPIO-02 | D4      |         | This is TXD1, connect it to GPIO-01 |
 *     | GPIO-03 | RX      |         | Leave it unconnected for flashing   |
 *     | GPIO-13 | D7      | TX      | TX level is same 3.3V as esp8266    |
 *     |         | VU (5V) | VCC     | The rdm6300 must be powered with 5V |
 *     | GND     | GND     | GND     |                                     |
 *
 *     * GPIO-01 to GPIO-02 is for debug terminal output.
 *
 * Arad Eizen (https://github.com/arduino12).
 */
#include <rdm6300.h>

#define RDM6300_RX_PIN 13 // can be only 13 - on esp8266 force hardware uart!
#define READ_LED_PIN 16

Rdm6300 rdm6300;

void setup()
{
  /* Serial1 is the debug! remember to bridge GPIO-01 to GPIO-02 */
    Serial1.begin(230400);

  pinMode(READ_LED_PIN, OUTPUT);
  digitalWrite(READ_LED_PIN, LOW);

  rdm6300.begin(RDM6300_RX_PIN);

  Serial1.println("\nPlace RFID tag near the rdm6300...");
}

void loop()
{
  /* if non-zero tag_id, update() returns true- a new tag is near! */
  if (rdm6300.update())
    Serial1.println(rdm6300.get_tag_id(), DEC);

  digitalWrite(READ_LED_PIN, rdm6300.is_tag_near());

  delay(10);
}

I tried merging the code but had no good results. Does anyone know how to get it to use the 2 readers at the same time? There is little to no information on doing that on Google. Thanks in advance

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