how the fuck porsche engines name

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Trying to understand porsche a little better. I've worked on a few gt3 cup cars, but really don't know shit about porsche in general.

One problem i'm having is distinguishing the different variants of these fucker engines. Does porsche even name their engines? Is there a common designation? Every other manufacturer has a name for each engine, family at least. But everything these nazis make is a 6 pot boxer, there must be engine codes.
What's the name for a 2.7 in a cayman? How about 3.4 in the cayman s. How do you even shop for a specific engine to swap into your base model carrera to upgrade it?