Only texture files are 100% compatible.
The model of the body won't work and hair it's better to re-do it. It has different codes.
You can paste the facexxxx.iff file from last year with no problems.
Assuming by your user name you want Gary Payton
I modded him last year, maybe the file is still there in my 2k18 thread. You can put the facexxx.iff file but the model file has to be reworked. And this is better to do it every year, because they always add something new.