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DDR is DDR is DDR, it's all the same stuff, just make sure you get the correct type and speed for your system.
 
If your profile is right and you have a 750mhz G4 then NO!!!!!!!!!!!!!!!!!!!!! altho i never heard of a 750 G4. Only the Mirror Double Door (last 2 generations of PM G4) accept DDR. All other powermacs require standard sd-ram and there is no way to change it. The dual 867 used pc2100 and all others used pc2700 i belive in the MDD powermacs.
 
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