Fire control systems matter. A 125mm from a Sprut has not a great chance of hitting anything before the Sprut is hit itself. The FCS onboard 99 and 15 are surely many, many leagues above the Sprut. Even the Type 96A I'm confident would be able to successfully drive, turn, and shoot while hitting Sprut before the Sprut slowly takes aim from stationary positions. FCS comes before ammunition quality and gun. You gotta hit your target first before the round can do damage to the target.THe level of armor protection on the Sprut is so poor that a Chinese IFV with a 30mm autocannon can penetrate it. So it's an improvement in Indian capabilities, if the Indians do sign the contract, but not that big an improvement. The fact that its 125mm can reliably penetrate even ZTQ-99s from the right angle is worrying, but the lack of protection means that the ZTQ-15 can easily destroy it in a fight, as can any anti-tank equipment the Chinese deploy. It's likely to be even penetrated by Type 69s.
There's little chance the Sprut has better FCS and hydraulics (no way!) compared to modernised T-72. Those modernised T-72s already have abysmal FCS and pretty much comparable to Type 96 original and at best (for the latest T-72 variants) roughly equal to Type 96A/B levels. That's no comparison to what the Type 99, 99A, and Type 15 use. So the Chinese tanks won't only be running while shooting, they will also see Sprut first and fire first and fire far more accurately.
For instance, the Japanese claimed rather publicly that the Type 10 FCS is so amazing that a Type 10 can destroy multiple Type 99 tanks before it is overwhelmed itself. That's because it supposedly can detect and outrange Type 99 with its superior FCS, gun + ammo combos. This of course is really up to debate since the Type 99 carries pretty decent FCS and has gun fired ATGM which outrange the ballistic ammo on Type 10. Type 10 is also very poorly armoured by modern standards. Super expensive high tensile steels are a stooooopid way to design modern armour. Sorry Japan you got really lazy with the Type 10's protection design. Methinks Nippon Steel and the rest of the corporate gang shoved some serious yen down a few throats. Then again it was always designed as some sort of mobility ace with admittedly excellent firepower. They just better get a good APS on that tank to improve defence against missiles.
No way Sprut has even a half decent FCS given the antiquity of the platform, how few of them are in service with Russia, no modernisation programs, and no Russian interest in this light tank anymore.