Technically they are all certified as 900s.
The old MDHI wanted them all called MD900's [hence my built in preference to refer to them as that over the years] but PAS were always [confusingly] marketing them as a McDonnell-Douglas MD902 [and McDonnell NEVER built or sold a 902!] but the new owners have now plumped for 902 and [when I think about it!] I now call them that.