Well we shoud know very well this problem --> PT-91 whit Drawa FCS. Mucht better FCS then in T-72M1 without FCS in reality and accuracy in move and in stand the same couse not changed gun, stabilisation mehanism and turret elevation mehanism.
Only in PT-91M accuracy is far better couse change ALL "fire system" :gun, stabilisation, elevation and traverse mehanism, FCS (SAVAN-15) new sights, panoramic sight and other.
Seems like Russians never learn, i fail to understand the purpose of an upgrade without changing basic elements, stabilization and FCS, well, t-72 never really had an FCS, not in early versions till B atleast, still no FCS in a supposedly new upgrade. Also, it is not worthwhile to integrate a panoramic sight without having a proper fire control system.
Compared to it, the t-80UA and UE-1 upgrades have covered much area, while UA is an eleborate upgrade of t-80U, the t-80UE-1, a t-82B hull with a t-80U turret and other improvements to FCS etc.