Why its ok for the 2 MUTO's to look alike and MUTO theory

Why it is ok for the two MUTO monsters (8 legged and flying) to look alike. Now obviously these two monsters have to be of the same species to team up against Godzilla because two completley diffrent species working together isn't that realistic.Now on to my MUTO THEORY. 

I believe that these two monsters arn't either of the final bosses. I think that these two creatures and the rest of the MUTO's are working as a hive to kill Godzilla. Why? So they can absorb all his awsome nuclear energy for not only to give the MUTO eggs some fuel to survive on but for a new monster I made up called the "Breeder". Now the "Breeder" has this ability to lay thousands of MUTO eggs without needing to gather nuclear energy so this gives the MUTO's a great opertunity to save thier race.But the breeder needs more energy because it has turned weak after fighting Godzilla in ancient times. Now not necisarly a legend or any crap like that. But like they have been fighting for thousands of years just because with nuclear energy it helps them stay immortal ( They can be killed but I mean they don't die of old age). So the two most deadly MUTO's ( which I call these two preatorians) go of to lead the MUTO hive to kill godzilla. Thats my theory on how the MUTO hive works and yes this is 99% wrong but its fun to speculate :)