Sorry, but the Dash number is simply, and only, to denote which application (A/C) the engine is configured for.
Numbers/letters behind the mark number but in front of the dash are for specific configuration/performance differentiation within a type, and should be certified independently (or at least, appear separately on the Type Certificate). Within these variants there are likely to be (over time) many valid build standards.
A slash number (/xx) behind the Dash number denotes a specific build standard for a customer.
(Caveat: The Trent 1000 is a bit of an oddity in this respect)
I understand the Air Transat glider incident was related to partial Service Bulletin incorporation, and not to rating, Dash or Slash number confusion.