the two godzillas are they diffrent

that skeloten did not look like a godzilla skeloten, if you look carefully it is the same thing for miles, the ribs are small and it does not resemble any godzilla skeloten you find on google images. 

It could most likely be a monster that Godzilla fought in the past, that has since decayed.

Might be the multilegged monster that we saw in the extended teaser trailer

true,but Gearth did rase a question in his own trailer analysis

he  said that " if godzilla was in dorment, could there have been more like him?''

obivisly im paraphrasing it but clck on it if your not sure...

look up godzilla trailer breakdown by Gareth edwards.

Almost 100 percent certain that the skeleton is of another, non bombed Godzilla-- thus why it looked so different. But for those of you saying that the skeleton is of a snake like creature (the centipede monster) know that it'd have to have bones connecting about it to form junctions in which its many legs/arms would protrude.

If you look at the trailer, they are walking through what appears to be a hipbone, or something similar. I'm no expert on animal skeletons, but I'm pretty certain that skeleton is a Godzilla.