[Closed] Can I change BB from

Yes

Yes, but the bottom bracket shell might benefit from being faced, If theres paint on it for example, you might be okay but check with a feeler gauge or visually inspect when the cups are almost touching the shell, see if the gap is even, the cups should touchdown evenly, a magnifying glass and torch helps.
People who go through bottom brackets quicker than most people probably haven't got a perfectly faced shell.

Or they overtorque the bearings if using shimano cranks, it’s surprisingly easy to do.