Grimlock's overall 'engineering' remains identical even if 'kibble' has been changed to represent the corrected T-Rex shape.
Snarl is pretty much 'What the hell?' as he is completly redone from scratch which I find it odd as he didn't really have to be.
The same goes for Swoop and Slag (although to a lesser degree than Swoop).
When it comes to Sludge, its hard to see him properly but it seems that he like Grimlock, may have kept his general 'engineering' without major change (although robot mode detailing is way different) and despite his G1 alt mode becoming obsolete, he still passes as an Apatosaurus as the general shape of the dinosaur remains the same.
When it comes to my pic, Despite their differences in look and design, they are still Dinobots and identifiable. I am basically tributing a comic which focuses on the 5 characters that in comic form, have more or less remained the same as a group and individual characters particularly when it comes to Grimlock and Swoop.