Not completely. Though you are right that apart from the very early days the Joes never wore. . .er, uniform uniforms, their styles have changed quite a bit over the years, and the transition from cool, mid-80s Joes to weird, early 90s Joes was really not that different than the transition from G1 to G2 Transformers, IMO.
The first Joes (81-83) were pretty similar to one another, with only minor differences for the most part, followed up by the 84-86 "golden era" that most people are familiar with, but after that, you get aliens, sci-fi characters, pirates, ECO-Squad, Robo-Joe and the rest of the Star Brigade, then you have Spy Troops and Sigma Six in this decade which clearly have little to nothing to do with previous Joe "cannon." Honestly, it is very similar to Transformers, as characters with the same names keep popping up, but they may have very little to do with these characters' previous incarnations. I mean, Firefly as a ninja was actually part of the Larry Hama era, but clearly the original character was not intended to be the lime green piece of poop that he was "turned into" by the geniuses of early 1990s Hasbro.