Low Poly and High Poly black mask based on height?

kyleb

I am trying to make a sign, I've used a displacement map on a high poly plane to indent it with text. I've then baked it in substance painter with a plane and it looks good, however, is there any way I can black mask the lowered inner text with a different texture?



As an example, I'd like the different texture inside the text. I kind of don't want to paint it, so I'm looking for a little guidance.

poopipe

histogram select on the heightmap is probably the easiest way to get a mask