Also I previously used transfer maps in Maya to do this. I have Maya 3D Coat and Marmoset Toolbag 3, so would be preferable to be able to use these to do it or a plugin for one of these.
This is a bit of a long work around and i hope there is a quicker method but this should work.
Use Xnormal, you can individually transfer maps by using the original mesh as the 'high poly' and put one of your pbr textures in the base texture slot, then the new mesh with the new UV set as 'low poly.' Then in your bake options just pick bake base texture, you then repeat this for each of the of the other textures. the method is basically the same as this video from eat3d https://www.youtube.com/watch?v=e8M4wrCBcDE but without the zbrush and normal map parts.
You can do this with Toolbag 3. Load the original mesh into the baker's high slot, and the new mesh into the low slot. Set up the material for the original mesh with all the inputs you need (normal, abledo, metalness, etc), and choose the same maps in the baker options for output.
Replies
Use Xnormal, you can individually transfer maps by using the original mesh as the 'high poly' and put one of your pbr textures in the base texture slot, then the new mesh with the new UV set as 'low poly.' Then in your bake options just pick bake base texture, you then repeat this for each of the of the other textures. the method is basically the same as this video from eat3d https://www.youtube.com/watch?v=e8M4wrCBcDE but without the zbrush and normal map parts.
Thanks very much!