A friend of mine wanted to buy a DDR arcade cabinet.
I wanted to help so I fell head first into a rabbit-hole of information about these, there are so many models.
I spend a good 2~3 days making this flowchart. It should make it possible to pretty reliably identify a cab from just one or two pics (which is sometimes all you get on a sales post) :
Many thanks to Jeffrey Carl Faden for curating most of the info in this blogpost : Types of DDR Cabinets and PCBs
Finding good pictures was agonizingly difficult. Is it just my memory failing me or have the text-based Google image search result become completely useless as of recently ? Seems like only the AI-based stuff (like the "similar pictures" thing I guess ?) gets you closer to what you want.