dmt 325 vs 1200

i was just curious if the dmt 1200 (or even the 600 for that matter) would do as good of a job lapping as the 325 or if there is reason why the 325 seems to be so much more common. was thinking about ordering a new stone for lapping and just thought of this
thanks
-dan-

Is not recomended by DMT to use the higher grits for lapping as They say it can damage the the plate,I do it all the time,have not had any issues.