Just a heads up if anyone even cares, but between 1991-1993, the flag of the Russian Federation looked a little bit different as it does today, it had a bright blue rather than dark blue line, and was a little "longer" (dunno what this is called)
The flag of the Russian Federation from 1991 til 1993, and presumably throughout the Gaidar government looked like this:
The current OTL flag of Russia was adopted in 1993, following the 1993 Russian constitutional crisis (which ITTL snowballed into a full-blown civil war)
Assuming that butterflies are working, perhaps the 2000 flag revision would not have occurred ITTL, and the flag of the rump state known as the Russian Federation would still use its older flag design, so for the sake of convenience and to highlight the difference between OTL and TTL Russian Federation, I personally think that it would be better to use this
flag as the flag of Russia.