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SP is the L2 "brains"
RP is the L3 "brains"
SP = L2 engine
RP = L3 engine
Forwarding engine could be either, although often more used for L3.
I would suggest you search the Internet for these terms. You'll get much, much more information. If there's a specific point that's unclear, then you might post a question in this forums to clarify it.
The problem with your question, to answer fully would take up to a book, which you'll discover if you search the Internet.
