I have a basic question, the PW4060-3 is a generation after or before the PW4000/94?
PW4000/94" refers to the fan diameter - i.e. 94 inches (there are also 100" and 112" versions of the PW4000, used on the A330 and 777 respectively). Only the 94" PW4000 was ever fitted to the 767 and 747-400 (the engines were literally identical and could be swapped between the 767 and the 747-400 with little more than a different rating plug). So in short the PW4060-3 is a version of the PW4000/94".