Ya, some belly shots will always give the best answer for yellowbelly. I have a little fire yellow belly and he looks a lot like number one, which is great for what I'm trying to do with axanthics. From what I've noticed, spending hours looking at fire yellowbelly, is that fire affects the alien heads but YB affects the black, gives these little blushes up from the stomach. Look between the more extreme snake and your first, even tho they're smaller, he has those little flare blushes in the black striping along the tummy. Another was the yellow color along the edge of the tummy before reaching the actual tummy and last thing I noticed about fire and YB is the head blushing. With YB, it's like it contains the fire, makes the fire marker really pop, like it has a border. Whereas with plain fire, the marker on the head goes wild. Notice how the YB marker comes to a point? It makes the fire marker come to a point as well when mixed together. But like I said, no expert, just spent hours upon hours looking at the combo so that when it comes to my own clutches I might be able to tell
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Here are a few belly shots of #1. Let me know if you think this may have YB as well. I do see some yellow coloration that I wouldn't expect to be there if it were just Fire, but it certainly doesn't scream YB.