I think MGTOWs don't deny that they "beo" vaginas in their heart. In that sense, MGTOWs and Maginas are same same.
The difference is how these two groups deal (differently) with vaginas. In football parlance, MGTOWs "dominate" the game, "control" the midfield, and as soon as they score goal, they are prepared to abandon the game and not play by the rules to play the full 90 minutes plus extra time.
Manginas are a different species altogether. Their strategy is to please the opponents, let them score as many goals as possible until they shiok shiok. So opponents like to play with them because opponents enjoy dominating the game and scoring goals like fun. To achieve that, Manginas often score own goals to make the opponents happy and give them that sense of victory and dominance. By so doing, Manginas hope that their opponents will never abandon them.