Suite, Ste or # in the address for citations, does it matter?

The format doesn't, but the suite itself can. If it's a virtual office or a mailbox at a shared address, Google's rules say no, the location has to be somewhere you're actually staffed during business hours. That's where suite numbers get listings suspended, not the abbreviation.

not really, Google normalises those. pick one (Ste is the US postal standard) and keep it consistent on the listings you control. not worth chasing old citations over.