Handicap Go does traditionally also alter the point odds; in an even game, a komi worth ~7 stones is added to the second player’s score, but in handicap games, the komi is set to 0 instead; so the mapping from board state to winning is not perfectly preserved. That said, a komi difference of ~7 is much more subtle than the difference that would be required to completely balance a many-stone handicap
Handicap Go does traditionally also alter the point odds; in an even game, a komi worth ~7 stones is added to the second player’s score, but in handicap games, the komi is set to 0 instead; so the mapping from board state to winning is not perfectly preserved. That said, a komi difference of ~7 is much more subtle than the difference that would be required to completely balance a many-stone handicap