The diffuse texture on the right is clearly more flat & less detailed. The lack of quality will obviously transfer over to the normal map. The specular & glossiness is oversaturated which I think was done purposely to hide the flatness of the texture. I think they also fucked up the normal map & specularity so that Harley's feminine curves are less pronounced.

Most likely a deliberate choice by the art production to take shortcuts & stay under budget. When you have to allocate money to a useless consultant firm like Sweet baby Inc, the original product quality will suffer.