Put some comparison shots of them together and tried to list out all the changes. For the original versions, I tried to use TakaraTomy official photography for a more apt comparison.
Skywarp:
- Black plastic and paint are replaced with charcoal gray plastic and paint
- Warm purple is replaced with cooler and slightly lighter more cartoon accurate shade of purple
- Silver paint detailing is replaced with light gray detailing
- Screaming Seeker head sculpt is replaced with stoic Seeker head sculpt
- Chest "fans" appear slightly lighter gray
- Canopy appears to be darker orange
- Light gray, formerly silver detailing, now extends a bit further on the upper torso
- Light gray, formerly silver detailing, does not extend as far up on the lower torso / waist
- Purple torso panels are now (likely painted) light gray
- Knee detailing is now teal instead of gray
- Gray "wing insert areas" (from the original toy that carried over to the animation models) are painted on in jet mode
- Horizontal stabilizer wings are purple (likely painted) instead of black for animation accuracy
- Striping colors changed to match other changes, may be different in size and or proportion
- Decepticon symbol is changed not to match the rest of the purple on Skywarp but the standard color used for animation based figures (lighter and warmer than Skywarp's remaining purple)
Shrapnel:
- Black plastic and paint changed to very dark gray
- Warm darker purple changed to a lighter cooler purple
- Black plastic on arms changed to aforementioned purple, likely through double running the mold in very dark gray than in said purple
- Silver paint changed to light gray
- Gray plastic changed to light gray
- Clear yellow / light orange changed to darker orange
- Silver paint on weapon removed, keeping it unpainted purple plastic
- Silver and blue collar detailing removed for animation accuracy
- Decepticon symbol on chest shrunken and moved up in placement
- Yellow feet sticker based paint removed for animation accuracy
- Silver and red insect detailing removed for animation accuracy
Bombshell:
- Black plastic is slightly lighter (like Shrapnel)
- Purple paint is replaced with gray
- Clear orange is slightly darker looking
- Silver plastic is lighter and it looks like his thighs might be painted but that could be unique to this promo shots
- Silver paint appears lighter
- Gold paint on head is removed
- Gray parts on arm joints are painted yellow
- Yellow is more vivid
- Silver plastic on arms is now black (likely due to double running these parts)
- Black upper thighs are now silver (likely due to double running these parts)
- Silver plastic on heels is now black (likely due to double running these parts)
- Blue paint in insect mode is removed for cartoon accuracy
- Red and silver stripes are removed for cartoon accuracy
- Decepticon symbol is more bluish and slightly different placement and likely size
- Black back torso piece is now gray (likely painted)
- Black plastic on lower torso is painted gray to match the rest of the torso (this is likely tied to the above back torso piece)
Kickback:
- Clear purple Energon blades are removed
- Clear translucent wings are now silver plastic or painted silver
- Metallic purple paint on gun is now silver making the entire gun silver
- Black plastic is likely a little lighter like the other Insecticons appear to be
- Clear yellow plastic looks a bit darker and more orange
- Yellow appears to be more saturated / darker
- Silver paint on head is removed and left black for cartoon accuracy
- Purple plastic appears lighter and a less warm / more cool shade of purple
- Green paint on torso is removed
- Gold and red sticker based painted detailing on legs is removed for cartoon accuracy
- Eye paint appears more vibrant (could be just photos)
- Silver paint on gun is likely different like the other Insecticons
- Decepticon symbol looks mostly the same but likely has some adjustments
