Yes, the viewscreen was also modified from season 1 to season 2 when the set was moved to stage 8, on season 1 that inner bevel wasn't so deep and didn't have the ribbed texture. The carpeting was changed every year, sometimes more than once. Often to the same exact colors, sometimes to new ones.
As for these modifications from 1990, they obviously weren't done in the end. The shape and curvature of the viewscreen remains constant through the series.
This is total speculation on my end, but the change would've meant the screen area would've been made flat, so perhaps they intended to project stuff onto it rather than adding everything in post, but decided not to pursue that due to cost. I also have a feeling more of the bridge was gonna be changed alongside the viewscreen.
It'll be interesting to see how close I got mine from eyeballing the museum piece.
