Board Thread:Questions and Answers/@comment-4548390-20151121015752/@comment-5448995-20160223083349

This interview also confirms that the Secret Wars Maestro is the old Maestro and the current one, they go through his history a little.

http://marvel.com/news/comics/25770/a_master_of_champions

As The Many-Angled One said, its just a re imagining just like all the other domains, again, their minds got wiped(slightly) they are living in a world where they are ruled by a guy named Doctor Doom and their environment is completelly different, so this will happen diferently obviously, but as far as I'm concerned its the same Maestro.