About the variant consoles. The one on the left that says "Arcade Legends Flashback" was purchased in illnois at a meijers. There is another guy from Ilinois who has a youtube channel called "Tim's Tiny Arcade". He has the same "Arcade Legends Flashback" model. The models I got from Walmart here in Illinois say "Legends Flashback". They seem to be the same, I can tell you Mortal Kombat is not on either unit. The boxes of the two units are identical (The box says "Legends Flashback"). some info on the bottom of the deck is different tho. The picture you showed says "At@Games Classic Flashback" on the unit, but "Arcade Legends Flashback" on the box, so maybe that's a mockup/prototype deck.
Question. Is there a way to run everything off the sd card like the Atari FB9 CFW so we can add roms and artwork to the main UI?