But this is clear difference and yours doesn't qualify for comparison.
The war of bangladesh is for liberation and was yet another freedom struggle. Your paki rulers tried to dummp urdu over the bangla speaking mass and went out for illegal settlements. This is where any freedom struggle starts and being a democratic having its roots from afgan to myannmar, it did its job (actually half job).
The situation but in kashimir is because of pak sponsered terrorism. While separation, as per common guidelines, the rulers of self-governed regions like Kashmir were given the choice to join any sides. The prince of kashmir opted India and your pakis intervention and occupation is illegal.
Got? Paki or any bluffers should understand the concept before.