Will all viscous couplings that are exactly the same have to same number stamped on them? Eg v5 wrx is a T4765, v5 sti is a R3542 and that's the end of it or could a v5 sti also have a R5213?
Reason for asking is I've just changed one that ment to be the same but had a different number on them.

These are just examples and not actual numbers.