[DS] miniature sizes

I have a set of plastic miniatures for Renegade Legion - Centurion.
They a bit small to me.  I don't own any of the Dirtside miniatures 
produced by GZG.  Would someone who owns both lines of miniatures 
do a side-by-side comparison and tell me if the two are compatible?
Or are the Renegade Legion - Centurion miniatures indeed smaller than 
the Dirtside vehicles?

--Greg