When you shook your "swarm" bees into the nuc, did you give them a queen or queen cell?
If they've been queenless this whole time, they may have laying worker(s). The eggs and larva you see are most likely drone brood from laying workers. In extremely rare cased, thelytoky will allow queens to be raised from unfertilized eggs. But the brood is likely "viable", in that they will grow to be drones, though likely undersized drones. If you join the two queenless nucs, you will most probably wind up with just a larger laying worker colony.
If they've been queenless this whole time, they may have laying worker(s). The eggs and larva you see are most likely drone brood from laying workers. In extremely rare cased, thelytoky will allow queens to be raised from unfertilized eggs. But the brood is likely "viable", in that they will grow to be drones, though likely undersized drones. If you join the two queenless nucs, you will most probably wind up with just a larger laying worker colony.
