Couldn't you just use the vag eeprom programmer and read the skc of the 2 clusters and reprogram the s4 cluster with the original car's pin?
No you can't use pin code from 2001 cluster in 2002+ clusters. It will not accept it
You can try, but be ready to change pin in ECU and buy new transporers id48 for keys
Use visual me7logger and me7eeprom to change pin in ECU
This will also change VIN in cluster that will not mach car's VIN, it does nothing but if someone check it you will need to explain what vas the problem