Honestly, I'm not very familiar with their cartoon models, having never watched more that a small bit of the cartoon. With that being true, I could see a lot of people being unhappy with a straight up repaint or slight remold. I wouldn't be one of those people, but I have to admit that I'm a pretty small demographic for Hasbro to try to appeal to.
Just for the record:
Like I can see Vortex being painted to match Ro-Tor and it not looking out of place. Brawl and Armorhide are almost the same, except the arms; so again I could see just a recolor working for him without much issue. But there's no way Swindle and Blastoff can look like Rollbar and Movor without completely new torsos, and a new head for Movor. Onsluaght is kinda 50/50 I could almost see a creative use of painting getting close, but he'd probably also need a new torso.