I guess it's too much to ask if Dark Horse has collected all the stories from each of these two collected volumes into a single Omnibus or tpb collection?
I sort of hate to buy both tpb collections since it appears they both include the story "Hellboy in Mexico", but I'm assuming there are other stories in the Hellboy in Mexico tpb that aren't already included in the tpb collections Vol. 1 - 12 (plus the Hellboy in Hell Vol.1 and Vol. 2 tpb collections)?