Ultimate Muscle: Anime Ending vs Manga

Comparison of the ending of the anime Ultimate Muscle: The Kinnikuman Legacy with it's manga source.
I was totally surprised that the anime changed the victor of the match from the manga.
Manga is Kinnikuman II Vol 21, Chapter 210-211.
Episode 77 of the anime, Ultimate Muscle.
0:00 (Manga) Kevin uses Olap
0:09 (Anime) Kevin Uses Olap
0:32 (Manga) Arm Twist
1:01 (Anime) Arm Twist
2:16 (Manga) Big Ben Edge
2:38 (Anime) Big Ben Edge
4:28 (Manga) Mantaro defeated
4:55 (Manga) Kevin wins
5:39 (Anime) Mantaro wins
6:01 (Manga) Mask heals
6:54 (Anime) Mask heals
7:36 (Manga) Mask wears belt
8:00 (Anime) Mantaro wears belt