Cattleya Rex Ayacucho vs. Moyobamba

[mopwr]

I've always wanted a Rex to grow since I first saw them and I recently managed to land a Rex var Ayacucho. I've read up on the care of Cattleya Rex fairly extensively and saw a particularly good video by William Greene, but there's one thing I haven't been able to find anything on significantly:

What are the biggest differences between the two subspecies?

Follow-up: Are there any flower differences - if so what are they?

So far, the only differences I've gathered from digging is that there are claims that Ayacucho forms are more uncommon than Moyobamba, they are more compact, are potentially a little fussier to grow (no reasons given), the underside of their leaves turn purple at high light levels, and they typically have fewer flowers, but the flowers are larger in size.

All of those details are interesting, but not a lot is definitive. I've heard that there are flower differences, but there's not a ton of detail there. The description I read, read something to the effect of "They are hard to tell apart, but an experienced grower could identify which was which if in bloom side-by-side." Surely, to qualify as a subsepecies or a variation, there'd have to be something a little more quantifiable, no?

Regarding the care, I've heard they are slightly different in terms of ideals they seek, but no detail there either. I plan on learning and experimenting (and sharing any successes I make), but with warnings like "these are really fussy / challenging" I just want to make sure I get it to live long enough to report back. The only thing I think I have going for me is that I will be growing mine in my terrarium setup where it can get 12 hours of high light year round (something it couldn't get at my latitude) and warm-ish temps (around 80+ day, mid 60s at night) with humidity stable around 80%... And that fits the general care guides I've heard for this species.