Probably more than you asked for, but here goes... hehe
Cool stuff! (It may even have been me who said that cross would be a waste of time. It sounds like me, anyway. LOL!)
Yep, you got it right, they're both het for amel, or as they say the one's "het for butter" and the other is "het for snow."
If you like butter motleys, you can make them in the next generation, just gotta grow one up first. You can hold back one of the amel mots and breed it back to the Carmot.
Your odds on that are an even 4-way split of:
Motley
Amel Motley
Caramel Motley
Butter Motley
(Bonus: all non-butters are known het for butter motley, too.)
Also, you could do snow mots, obviously. Depends on which sex(es) of amel(s) you keep.
With breeding back to the Anery motley parent, another 4-way split:
Motley
Anery Motley
Amel Motley
Snow Motley
(Same bonus: known hets for snow motley.)
With breeding two of the amel mots together (they're both het anery/caramel) you'd get a standard "double-het cross" result with amel motley on top:
9/16 Amel Motley
3/16 Snow Motley
3/16 Butter Motley
1/16 Snow motley (also caramel but you wouldn't know it, or could you tell when it grew up?)
If you like any of those results, definitely go for it. The coolest thing about it
(another bonus) is that you'll get ALL motleys from any of those crosses, which will give you more selection for the motley pattern itself. Amel is amel, anery is anery, caramel is caramel. But not all motleys are created equal, and you get the biggest number to choose from.