Damage to bearings from press fit bb removal? Is it possible to remove the bearings from one bike's bb and put them on to another or would using a tool such as the Park tool bbt 90.3 damage them somehow?
The major concern is that whenever the inner race gets loaded to extract the bearing, it's subject to getting damaged. BB86 and BB92 cups don't get removed by bonking the inner race, rather the plastic cup, and so if one of those types of bottom bracket felt good before removal, I think re-using it is fine. The "rocket ship" type tools (Park BBT-90.3) do have the ability to chew up the plastic cups where they make contact, and I've seen this be significant although it usually isn't. Usually the interference fit is pretty "gentle" on BB86 and BB92.

All of the systems that involve bearing cartridges pressed directly into the frame (BB30, BB90/95, others) are prone to the bearing race surfaces getting damaged during removal. If you were to reinstall them there might be notchiness and drag, and probably to some degree will be. That doesn't mean they won't have any kind of service life at all. If the bearings were  clearly in good condition when you started, and it's your own bike or a charity case, re-pressing them may be reasonable. It's a judgment call and you may not like the result, or it may be fine. A shop doing it for a paying customer would be bad.