The recent SDBH manga chapter revealed the Hearts absorbed by Ozotto is from a different spacetime.

In the new recently released SDBH Meteor Mission manga chapter Goku notices that the Hearts who is helping them is not the same one who participated in the Super Spacetime Tournament.
Dialogue- Gohan thanks Hearts for his help and says wasn't Hearts at the Super Spacetime Tournament.
Hearts doesn't know what he is talking about and Goku realizes that this Hearts is not the same one from the Super Spacetime Tournament. That Hearts from the Tournament was from a different timeline.