Thought of putting this up just for reference. Asuming Weakpurr is close to Bumblebee's height (whatever Bee's alt form is, I doubt it's bigger than Pagani Zonda), and Wingbomber is close to Prime's height (he becomes much bigger in vehicle form), I guess this would be the difference between the two.

Might shade these two later on, just for kicks.

Weakpurr belongs to
Wingbomber and art are mine.
Transformers belong to Hasbro.