Can i use Adaptive Planning and change a condition Token to one i already have?

Can you use Adaptive Planning and change a condition Token on a unit, to become a condition Token i already have?

Yes the result would be that from 2 condition Tokens you'll end up with only one, cause you would lose the second condition Token, being it the same type as one you already have.

YES

YES, you would then lose it, resulting in a unit with only one condition Token.