Did you 'compress' the messes? Meaning removing all duplicates through indices.
If not this easily reduces most parts by 20% or so. Could take ages on large meshes though (depending on hardware etc) even with lookup tricks etc. Before comparing you can safely round all coordinates to 4 or 3 decimals depending on your quality wishes.
If not this easily reduces most parts by 20% or so. Could take ages on large meshes though (depending on hardware etc) even with lookup tricks etc. Before comparing you can safely round all coordinates to 4 or 3 decimals depending on your quality wishes.