Ultramel Anery vs Ultra Anery..
I'm not sure if they are visually different, at least not enough to tell between the two. Like with regular Amels, Ultramel Anerys can have a wide range of colors and looks. I've seen some that are very dark and some that are exceptionally light. I'd imagine that Ultra Anerys are the same way.
The amount of yellow doesn't seem to me, to be an indicator of Ultra vs Ultramel either. I think the amount of yellow has more to do with the age of the animal, as it tends to develop as the snake grows older.
The only way to be certain if it is het or homo for Ultra, would be to breed it to an amel or snow. Unless it had come from Ultra to Ultra parents, which I know you already said it didn't.
It's hard to really say if that one looks different than a 'normal' yearling ultramel anery or not due to it being in the blue. Either way, it's a beautiful animal.
Here's a pic of our Ultramel Anery as a yearling:
You can see he looks fairly different from the other Ultramel Anery that was posted, but still not looking like an odd colored snow either. He has a definite look to him, and his yellows were just starting to come in at that time. If you're interested in seeing how he looks now, let me know and I'll snap a few pictures of him as he's almost a full year older than when that pic was taken.