Hello!
In most pictures that I have seen it's either red-red, or the colour gets a little bit on the dark side. Then again, in an economy like the Soviet, you can't really be too picky about the paint you get - you're glad you have any paint at all, so even if the tone were a little off, you'd still take it. So it is possible that the colour might have drifted in some aircraft, but then again it's unlikely, because a deep red colour is easier to get with simple chemistry (iron oxide!) than orange.
Ultimately only very few people live hwo have seen this colour personally in 1944 or so, and most of them can't be trusted anyhow, so now it is your decision if you take the colour or do something about it.
Hope it helps - good luck with your build and have a nice day
Paweł