1) does it have a dry clutch......if the answer is yes it either an SE/SP, if the answer is no its an R

2) assuming it HAS a dry clutch does it have MAGTEK one one of the spokes on each wheel and blue (cheesy) anodised bits on the fork tops......if the answer is yes its an SP if the answer is no its an SE

3) if it has a dry clutch and blue (cheesy) anodised bits but no Magteks then it is likely that its a SP that has lost its Magteks.

all the info you need.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold