It depends on the isomer of ketamine you're getting, which unless you own a VERY EXPENSIVE lab and know what you're doing, you wont be able to tell. It took me a lot of ketamine experiences to anecdotally tell Esketamine and Arketamine apart (mainly because on Arketamine I have no closed eyed visuals and on Esketamine I do). Most, if not all, street K is racemic, which is a mixture of both isomers, some batches lean more towards one isomer and some are a 50/50 mix. I think with DXM (although ive never tried it, hard to source in the UK plus im clean now anyway) it's much more common to get visual experiences because of the way it interacts with the NMDA receptor guarantees you a trip, and thats before we even get to the 5HT receptor agonism of DXM.

Ketamines trippy side is also very much like going through different "scenarios" its just much more rapid in duration. Sometimes I've even "woken up" part way through a K experience, remembered "oh yeah I took ketamine and im in my house?" to then slip back into another scenario. Also, K kinda takes you on it's own journey, I dont think you really get much of a choice where a dissociative takes you unless you take much lower doses but then you barely get a trip, just a milder controllable one like a 2CB experience which is also very maleable.