This is how the various model years are referred to in Europe (and possibly Japan):
CBR1000RR4, CBR1000RR5 are the current 2004-05 model
CBR900RR2, RR3 are 954's 2002-03
CBR900RRY, RR1 are 929's 2000-01
RRT, RRV, RRW, RRX are the 918cc models 1996-99
RRN, RRP, RRR (!) and RRS are the 893cc models 1992-95
And the CBR600's (this is where it gets confusing)
CBR600RR3, RR4, RR5 are obviously the RR models 2003-05
CBR600FS1, FS2 are the CBR600F Sport models 2001-02
CBR600FX, FY, F1, F2, F3, F4, F5 are F4i's 1999-2005
CBR600FS, FT, FV, FW are F3's 1995-98
CBR600FM, FN, FP, FR are F2's 1991-94
CBR600FH, FJ, FK, FL are F1's 1987-90
Probably a little more than you wanted to know...