Two Oncidiums?
 

The first two images are of the same plant. The third image is from a different plant but with similar leaf structure as the first. Are these two flowers Oncidium species and are they the same with the second flower not being fully developed or are they different species? Photographed in Colombia.

I think its from different species. Pretty obvious to see that they have different shape of lip.

Yet, i still don't know whether both of them are Oncidiums.. perhaps the others know :D

I agree, different. The first looks like it could be something in the Oncidium alliance, even if not actually an Oncidium. Not so sure on the second.

I agree, not quite like an oncidium.

Grammatophyllum maybe?

That last one looks like something's wrong with the lip, like not fully opened up yet or damaged in some way. I could imagine that it's possible it could be a non typical form of the first flower picture. Hard to tell.

I would say the shape of the petals/sepals is completely different, not just the lip. The petals/sepals on the last one are more pointed tip rather than rounded.