If the Surrey-class cruisers had been completed, would York and Exeter be treated as separate subclasses?
Short answerPossibly; their visible differences already support separate York and Exeter subclass labels, and the completed ships' details would decide the grouping.
NotesYork and Exeter differed enough in appearance and arrangement to justify separate subclass treatment even though only two ships were completed. Additional ships derived from the program might therefore be described as three Yorks and four Exeters, depending on their final configuration.