Código exemplo Modificado e comentado pelo @joaoaugustocz.

Dois_sensores_de_cor_TCS34725.ino

#include <Wire.h>
#include "Adafruit_TCS34725_DUE.h"

/* Inicializa com os valores padrões(int time = 2.4ms, gain = 1x) */
// Adafruit_TCS34725_W0 sensor1 = Adafruit_TCS34725_W0();
// Adafruit_TCS34725_W1 sensor2 = Adafruit_TCS34725_W1();

//------------
bool S1; // SERVE PARA SABER SE O SENSOR FOI DETECTADO OU NÃO// S = 0 --> SENSOR
// NAO ENCONTRADO S = 1 --> SENSOR ENCONTRADO
bool S2; //
//------------

/* Inicializa com um 'int time' e 'gain values' especificos */
Adafruit_TCS34725_W0 sensor1 = Adafruit_TCS34725_W0(TCS34725_INTEGRATIONTIME_700MS, TCS34725_GAIN_4X);
Adafruit_TCS34725_W1 sensor2 = Adafruit_TCS34725_W1(TCS34725_INTEGRATIONTIME_700MS2, TCS34725_GAIN_4X2);

// TABELA DE VELOCIDADES e GANHOS:

// SENSOR1:

//  TCS34725_INTEGRATIONTIME_2_4MS       TCS34725_GAIN_1X
//  TCS34725_INTEGRATIONTIME_24MS        TCS34725_GAIN_4X
//  TCS34725_INTEGRATIONTIME_50MS        TCS34725_GAIN_16X
//  TCS34725_INTEGRATIONTIME_101MS       TCS34725_GAIN_60X
//  TCS34725_INTEGRATIONTIME_154MS
//  TCS34725_INTEGRATIONTIME_700MS

// SENSOR2:

//  TCS34725_INTEGRATIONTIME_2_4MS2      TCS34725_GAIN_1X2
//  TCS34725_INTEGRATIONTIME_24MS2       TCS34725_GAIN_4X2
//  TCS34725_INTEGRATIONTIME_50MS2       TCS34725_GAIN_16X2
//  TCS34725_INTEGRATIONTIME_101MS2      TCS34725_GAIN_60X2
//  TCS34725_INTEGRATIONTIME_154MS2
//  TCS34725_INTEGRATIONTIME_700MS2

void setup()
{
    Serial.begin(9600);
    delay(1000);
}

void loop()
{
    if (sensor1.begin())
    {
        S1 = 1;
    }
    else
    {
        S1 = 0;
    }

    if (sensor2.begin())
    {
        S2 = 1;
    }
    else
    {
        S2 = 0;
    }

    if (S1 == 1)
    {
        uint16_t r, g, b, c;

        sensor1.getRawData(&r, &g, &b, &c);//Pega os valores "crus" do sensor 1 referentes ao Vermelho(r), Verde(g), Azul(b) e da Claridade(c).
        
        Serial.print("R1: ");
        Serial.print(r, DEC);
        Serial.print("\t");
        Serial.print("G1: ");
        Serial.print(g, DEC);
        Serial.print("\t");
        Serial.print("B1: ");
        Serial.print(b, DEC);
        Serial.print("\t");
        Serial.println("    ");
    }
    else
    {
        Serial.print("R1: 0\t");
        Serial.print("\t");
        Serial.print("G1: 0\t");
        Serial.print("\t");
        Serial.print("B1: 0\t");
        Serial.print("\t");
        Serial.println("    ");
    }

    if (S2 == 1)
    {
        uint16_t r2, g2, b2, c2;

        sensor2.getRawData2(&r2, &g2, &b2, &c2);//Pega os valores "crus" do sensor 2 referentes ao Vermelho(r), Verde(g), Azul(b) e da Claridade(c).

        Serial.print("R2: ");
        Serial.print(r2, DEC);
        Serial.print(" \t");
        Serial.print("G2: ");
        Serial.print(g2, DEC);
        Serial.print(" \t");
        Serial.print("B2: ");
        Serial.print(b2, DEC);
        Serial.print(" \t");
        Serial.println("    ");
        Serial.println("/-----------------------------------------/  ");
    }
    else
    {
        Serial.print("R2: 0\t");
        Serial.print("\t");
        Serial.print("G2: 0\t");
        Serial.print("\t");
        Serial.print("B2: 0\t");
        Serial.print("\t");
        Serial.println("    ");
        Serial.println("/-----------------------------------------/  ");
    }
}

can you make the library available