Match Mesh by Name question

Hi so exporting more with baking and I trying to use the match by mesh name but I get this error that get me confuse. Now it says ot have the mesh name be _low and high and I did that but I get this error message that says the 2 meshes have not match so I'm a bit confuse. Here this is what I'm getting.  What is causing that even though I gave them the sufice that match.