As far as I figured out now is that VASO in Russia offers to upgrade the Il-76MD to the Il-76MD-90 standard, which is just a re-engine programme, no avionics/cóckpit or fuselage change.
TAPO in Uzbekistan on the otherhand offers the Il-76MF both in upgrade and newly build airframe. This is a bit more expencive because of all the changes in the fuselage and cóckpit.
But to make things more vague, there are discusions about moving the Il-76 production from TAPO to VASO, because Ilyushin and the Russian state don’t like things to be foreign, and they like to get some money from recent and future Il-76 deals, with for example China….