A very simple comparison of Dr. Gravitas' body against Rederick's. Green is Gravitas, Red is Rederick, and Yellow is where they overlap. As you can plainly see, Gravitas is a tad thinner and less bulky than Rederick with slightly taller ears.

Thanks to my new scripts, future shape alterations should be very easy to introduce, so I may differentiate them further later. Might make Gravitas a bit taller and it would be nice to differentiate their faces some.