I am going to go back and look again, but first let me say thankyou for taking good critique photos! For once!
And secondly, both of those horse are extrememly good looking , and if you can't find a saddle fit, you can always get "rid" of one of them . . ..my way. (hint hint)
Ok, looked again. I think that the black western one is "OK". It's very hard to tell on western saddles, especially ones like that that have cloth skirts. Everything it kind of rumpled and does not offer a clue as the under parts and how they are layingf on the horse. YOu can tell a lot more by feeling under the front of the bars for even pressure all the way down behind the shoulder blade, and allong the length of the tree for any bridging. I think that saddle is ok for use with him.
The brown one is too wide in the front IMO, and might be a bit close on his wither bone, both from above and from the sides.
The brown english one fits the mare "ok", like you said. I would like to feel to see if it is square and even on both sides (it looks a bit crooked in the panels, and might be crooked in the tree, too) to be sure that it isn't up against the wither bone on e one side, while looking just fine on the other. If so, then this one is ok, but the gullet channel back toward the back is pretty narrow, and as I said, does not look even. I would probably not do a ton of riding in this one, and it's not worth the cost to reflock.
The black one just plain looks off. It doesn't look right, at all.
I cannot recommend either of those saddle that you linked, havingt never used them. I don't personally like Wintecs, but a lot of folks do like them. Either way, you won't get one saddle that fits both of them, unless it's treeless.
They are both just lovely horses in good condition with very nice conformation.
ETA , again:
What's that on the bay's left hock?