Will the muto have a special attack

The MUTO actually isn't "a ant compared to godzilla," it is merely a matter of perspective. The MUTO creature is standing away from the airport, closer to a monorail (I assume), whereas Godzilla is MUCH closer to the airport, where the camera angle is poitioned.

Some may say that the MUTO caused the planes to explode, and must be closer to the airport to do that, but it didn't. A helicopter was damaged during the confrontation with the creature, spiraled out of control, and then crashed, igniting the fuel in the planes before Godzilla (who is nearly directly in front of the airport) steps into view.

As for the MUTOs special ability, probably flight, judging from the wings it seems to have.

I bet the other MUTO is as big as Godzilla, the Hokmuto from airport isn't that big (but it's not an ant, it's maybe half of Godzilla).

I don't think the MUTOs will have some special attack like the atomic breath, but I bet they are faster in aguility than Godzilla and one (or maybe both) can fly.

A few weeks ago I read a nice theory of the San Francisco bay scene where the planes fall into the sea. Maybe the winged MUTO can scream soundwaves like bats and so the military planes fall from the sky because all systems failed due the soundwaves.