There was a change in engine mount locations around 2005. There may also be a change in the swingarm shaft size around the 2000 time as well so the cases may be different. If the cases are different you should be able to swap over the transmission gear sets. If you do swap the internals, you may want to consider changing the bearings while you are in there. You can get these at a bearing supply house or dealer. These bearing and seal sizes work for the older 200, 250 and 300 bikes up to 2004. They probably cover newer bikes too, but double check the numbers or sizes to be safe.
GasGas Transmission bearings
Bearing # Grainger #
Counter shaft bearing 6305C3 4ZXJ1
Countershaft Seal 30x40x7
Clutch bearing 6205Zc3E
Trans shafts 6203c3 4zxe8
LHS CRANK SEAL KOK 20x35x6 (VITON) ktm 47030076100 04-14 105 85 65
RHS CRANK SEAL KOK 38x52x7 (VITON) ktm 0760385273 94-14 250 300
COUNTERSHAFT SEAL 30x40x7 Suzuki 09283-30061
Shift Shaft Seal 12x22x7
KICKSTART shaft SEAL 20X30X7
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