It´s promising but It doesn't work 100%, if you use a facexxxx.iff file from 2k21 on 2k20 you will get an invisible player. On the other hand, if you use the 2k21 pngxxxx.iff with a 2k20 facexxxx.iff file the model works almost entirely.
I imagine this is due to the way dds files are saved. Perhaps with some modifications on the txtr file we can solve it. If some of you are experiencing something similar, feel free to share your thoughts.
Here some previews:

