Let's discuss some of the various possibilities that this idea could be interpreted as, and how the MLP cast would interact with the Hazbin Hotel cast.

Hmmm, perhaps something along Monster High or some such? It's still Canterlot High, only in hell!

7091703
Maybe. Or they end up near the Happy Hotel or somewhere else in hell and end up meeting at least some of the cast of Hazbin Hotel. Could imagine Sunset meeting either Sir Pentious or Alastor. And maybe Twilight meeting Charlie. I dunno, I'm improvising.

7092484
Pinkie Pie meets Charlie... the musicals would never end!