So basically as the title says is there a way to make all similar UV islands same size without actually manually snapping them to the same coords. It takes a while.
Alright I found a way to do it. So in NSUV select UV island and use the function "GetTexelDensity" then select another UV island which is same and use the function "SetTexelDensity".
Nightshade can make stuff like this super quick, did a quick mockup to show one way to match simple faces. If you use the straighten uv you can do this with islands with more edges/vertices too.
Any way to do this in Maya LT? Nightshade uses Python, so it won't work. I downloaded and tried an old standalone mel script version of the Nightshade texel density script, and it didn't work for some reason either.
Edit: Found it! in the new UV editor's UV Toolkit: Transform> Tools> Texel Density> set
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https://www.highend3d.com/maya/script/nightshade-uv-editor-for-maya
If you use the straighten uv you can do this with islands with more edges/vertices too.
Edit: Found it! in the new UV editor's UV Toolkit: Transform> Tools> Texel Density> set