Not sure where a list of all variations would be, but there may be something out there. Lots of companies can have similar subtypes, as fins change airlines frequently, be it by lease or sale. I flew the 767 for 4 years, and my company flight summary has about 6 different 767-300 variations broken down. We got our fins from all over the place, we had fins from Hawaiian to Ethiopian.
It denotes the variation to the specific fin when it was ordered from the manufacturer. For example, if an airlines wants to use its 777-300 type for a domestic market and needs a smaller center fuel tank to make room for baggage and cargo, that configuration would have a different model subtype number, such as 777-3xx.
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