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Ctenuchinae
Achmmad and Karen, thanks for the comments. Bayucca, thanks for the ID (well, almost... :-). I had a feeling this one wouldn't be a piece of cake!
Same family, probably same genus, and maybe same species. I am not sure. I have seen it from Paraguay, but unfortunately no ID. Same yellow body part as both of yours. This one has some blue spots on the back of the body, the other not. Male/female? Different species (I rather would tend to male/female dimorphism)... Keep it separated as long we don't have a genus/species.
Bayucca, I was going to add these pictures to the group I uploaded yesterday, but this moth seems a bit different (specially that white spot in the back). Please, help me to ID it, if they are the same species, I'll move them to that group.