Can I use a UK Crunchyroll account on a US PS4 and viceversa?
Crunchyroll doesn't have regional accounts, they determine what you can watch depending on your current location. Example: you register in the US, then move to - dunno - Azerbaijan, you'll only be able to watch the shows available in Azerbaijan. Source

Crunchyroll also doesn't care about what kind of device is used with what kind of regional PS/Xbox/whatever account to watch their streams. Again, they only care about your current location.