Convert third party mesh UV map to SL default?

[Centerfold]

Hey all, I recently purchased a mesh head model from a website to work with as a base, for second life creations,  & I was wondering what is the best way to go about converting the UV map it came with to match that of the default SL, so it can work with omega appliers and such, I have tried marking seams as closely as possible on the new mesh to correspond with where the seams are on the default head, which got a close result at one point, but I never saved that file & haven't had any luck ever since, i'm just wondering if there is a better way that I am unaware of?Here is a pic of both the head and the default SL head uv maps:

 

[OptimoMaximo]

Depending on the software you use, there are UV mapping transfer tools.

Maya has Transfer Attributes that can work on meshes with different topology based off the items' world position.