Would probably "look" similar. I always thought Freaks and Geeks had a more modern-look to the cast than it did for its setting in 1980. That look reminds me of the movie Adventureland (Hmmm, Jesse Eisenberg and Kristen Stewart, despite set in 1987.... look like how they do nowadays, in the modern times). I don't know, just think Stranger Things does a better job in the "looks" department. If I didn't know Freaks and Geeks was set in 1980 and Adventureland was set in 1987, I would've thought they were set in the contemporary setting of when they were released (until told otherwise). Stranger Things, and even the new It, you look at those and know they aren't set NOW. Though that might be just me.
Also the new Wet Hot American Summer nails a lot of 90s schticks that are easy to forget even existed.
The tricky thing about the 90s is that they mostly don't exist. The early 90s are basically just the late 80s. The late 90s are basically just the early 2000s.
The 80s happened because of very specific technological changes in media. The only purely 90s things I can think of are music-related.
I always think the middle years are a good representation of what a specific decade "is". In the 80s, 80-83 still had some of that late-70s inspiration (even the last surviving slivers of disco worming their way into early 80s music), while the last two years, specifically 88 and 89 were a "preview" to the early 90s. I think 84-87 were the heart of that decade, and it is similar with the 90s. 90-93 were still seeing echoes of the 80s, 94-97 was a good slice of the heart of the 90s, while 98 and 99 was the "preview" for the 00s.