Is the PM only plate array content exactly the same as the cartridge?
No, the PM only arrays have probes that are perfect match only. The mismatch probes have been removed. For the HT HGU133 plus PM product roughly ¾ of the probesets have 9 probes, a small portion has 10; the remaining probesets have 11. The Mouse and Rat PM only plate arrays utilize all 11 probes for each probeset.