All these timers and their respective Interrupt Handlers are used by Servo.h library:
TC0, chan 0 => TC0_Handler
TC0, chan 2 => TC2_Handler
TC1, chan 0 => TC3_Handler
TC1, chan 1 => TC4_Handler
TC1, chan 2 => TC5_Handler
Modify the code provided by Copperhil (that you didn't post) to use another one.
BTW, you can include these 2 libraries together:
#include <due_can.h>
#include <Servo.h>