#Yes and no

There's no reason why not, apart from the fact that beaks became dominant to the point of exclusion for a reason.

To have a toothed flyer your world could be at a much earlier stage of an evolutionary cycle, perhaps not long after a mass extinction event when there were a lot of broad niches to be refilled and a lower pressure to be perfectly optimised. It may not be a particularly efficient flyer, but it can fly. Size wise, that's a question for consideration but a mating tendency towards "biggest and strongest" could make for a big creature.

In the long run the efficiency and lighter weight of the beaked flyers would likely come to dominate and displace your overweight creatures.

Yes and no

There's no reason why not, apart from the fact that beaks became dominant to the point of exclusion for a reason.

To have a toothed flyer your world could be at a much earlier stage of an evolutionary cycle, perhaps not long after a mass extinction event when there were a lot of broad niches to be refilled and a lower pressure to be perfectly optimised. It may not be a particularly efficient flyer, but it can fly. Size wise, that's a question for consideration but a mating tendency towards "biggest and strongest" could make for a big creature.

In the long run the efficiency and lighter weight of the beaked flyers would likely come to dominate and displace your overweight creatures.