I've always seen the Deluxe Insecticons as part of the Insecticons... just as the Deluxe Autobots are also Autobots (although I guess the Deluxe Autobots are their own group). But we have other groups that don't have uniform designs.
e.g. Autobot Mini Vehicles: Bumblebee, Bumblejumper, Cliffjumper and Hubcap are all deformed vehicles really based on Choro Q/Penny Racer toys rather than real world vehicles. Their aesthetic clashes with the more realistic proportions of the other Mini Vehicles. Even Cosmos is
realistically^accurately proportioned to George Adamski's photo of a
Venusian flying saucer!
(that totally wasn't a fake photo of a modified surgical lamp
). Then there's Wheelie...
Needless to say that the Deluxe Insecticons' aesthetic certainly are different from the Insecticons since they're from totally different pre-TF toylines (not that any of us knew that in the 80s).

I'm surprised that you even saw any Deluxe Insecticons at the time since they were never released in Australia! I'm guessing that you or someone you knew must've gotten them from overseas (I know NZ had them).
As for Beast Wars, the Deluxe Insecticons' alt modes have all appeared in BW.
* Venom = cicada ---> Cicadacon & DJ
* Barrage = rhinoceros beetle ---> Ram Horn & Motorarm
* Chop Shop = stag beetle ---> Insecticon, Beetle & Scarem
* Ransack = locust ---> Scourge
Although I'd like to see a Transformer with a realistic/organic looking locust mode rather than a robotic/cybernetic Transmetal 2 locust mode (not really a robot in disguise).