I read a few things where I could change Blender's scale or 3dC's scale and I changed 3dC's scale as I'm currently only doing character retopo/painting in 3dC whereas I'm doing pretty much everything else in Blender (may end up doing other props in 3dC but I haven't got to that point yet). I'm pretty sure I made Blender use metres.

Changing the scale in 3dC doesn't seem to do much for the retopo section which is annoying but I can work around it. It's just annoying XD