>>403366183
The CATS export is actually just the default FBX export with some better default settings applied.
One of the reasons for this model scale discrepancy sometimes is the "Apply Scalings" option. This is set to "All Local" in default Blender which means your Armature and Body will have a scale of 100 when imported into Unity. After a strong recommendation on my part, Hotox changed it to "FBX All" when you press the CATS Export button. This fixed a lot of issues and headaches related to scaling objects and having to set absolutely tiny radiuses on dynamic bones, but it also means that if you export an FBX with default settings and then later overwrite it with the "correct" settings, your scale will be totally messed up until you reconfigure the humanoid rig.

On a related note, if you tick "!EXPERIMENTAL! Apply Transforms" in the export settings, this will prevent your meshes from being rotated -90 degrees on the X axis. Particularly useful for static/non-skinned meshes, not really necessary for skinned meshes like avatars or character models. The devs recommend against using it for models with an armature but it seems to work fine for me and most others.