Guides Blender 3.2+ Texture Conversion Templates (G3F/G8F/G9 to G2F) or (G2F to G8F)

[MrGiggly]

upper lip doesn't blend well,any fix

Not enough information in your question to understand your issue.

Which template, what does your source look like, and an example of what you are seeing.

Already posted an image of G8 to G2 on the main overview
Here's G2 (left) to G8 (right)

If you mean the inner mouth section, then you'll need to correct in Photoshop/Gimp as G8's mesh extends further in than G2