Nope , original T-90 , Object 188 , was firstly named T-72BA.
T-90A and Indian Bishma inherited re-designed T-72BA chassis but got new turret from Object 187 , far more advanced tank project than T-72.
Yes.
Considerable improvements in shipbuilding.
Project 636.3 "Improved" Kilo timetable from laid down to launch:
B-261 - 39 months
B-237 - 31 months
B-262 - 24 months
B-265 - 14 months
T-15 (Object 149) is this , engine is in front
https://defence.pk/attachments/pdn_6364-1-jpg.216995/
Israeli heavy APC logic caught appraisal from Soviet planners , this is 1989/90 Soviet project resembling Object 149. Soviets also wanted unlike Israelis to have serious firepower beside APC...