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How to import low poly version of model into High polys lowest division level

Hi guys I’m doing this in kind of a weird order. I sculpted the hell out of an axe so i could take cool pictures in keyshot. I forgot that i also need to bring this asset into unreal engine.

I have the original unsculpted model from 3ds max. I want to import this into zbrush so i can use UV master on it, and then somehow import it into the lowest subdivision level of my high poly model.

I read on another forum that this is possible but they didnt go into any detail on how to do it. Can someone help me out here?

I used a lot of dynamesh on my high poly sculpt and even when i decimate the hell out of it UVmaster freezes up when i try to unwrap it. I was told i have to use UV master on the original low poly model.

Project highpoly on to lowpoly, subdivided base?