She was repainted shortly before or just after delivery into a Soviet gray color. Some sources state the paint was thin, and a bluish tint still shown through, thus continuing the moniker. Most sources describe it as "flint gray," and with the brownish linoleum for the decks which you mention. While the Soviets did have manuals with recommended standardized colors, wartime shortages and other hardships seem to have made a situation where local units did a lot of improvising, so the standard was not strictly adhered to.
Here's an interesting discussion I found which Al Ross had concerning a project he was doing (not Tashkent related, but regarding Soviet colors) :
https://modelshipworld.com/topic/27890-wwii-soviet-naval-colors/
What is clear is that she was Azzuro while in Italian hands, and in a Soviet gray at the time of her loss. How much--if any--of a bluish tint showed through, and exactly what color gray, are the unknowns. Given the general lack of details and the loose painting standards, I would think any "interpretation" the modeler chooses would be just fine.
Other sources I found interesting (but not definitive) :
http://shipbucket.com/forums/viewtopic.php?t=10678
https://worldofwarships.com/fr/news/history/camo-history-2/
HTH
When I built Tashkent, it was not clear to me, if she was still painted blue and what kind of blue.
I decided for the Italian colour "Azzuro", for which I found as matches Federal Standard 35352 and Vallejo Model Color 64 (906). This is a light blue.
For decks, I chose a brownish linoleum.
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