Dos Epi's?

[Curtis2010]

I was all pleased with myself because I felt certain I had ID'ed Epidendrum Nocturnums here. Now that I look closer I think I actually have two types of orchid that look very similar. One, I think is a Nocturnum...I've even confirmed it smells good only at night. The other is either a different variety or an individual variation (however, if so, there a many individual plants here with this variation). One plant has relatively wide mouthed flower and wider sepals (than the other plant) which are more white in color than the other. The other plant has a very small mouth (but still split) and dark yellow sepals. The bit of the flower which "splits" the mouth is much narrower and longer in one than the other and tends to develop a curl or curve.

So, what do you think? Individual variations or two different types?

Pics attached.