If its like the Magura it's the bore dia. Their way of designating displacement. This was being discussed in another thread. The AJP is not marked, but seems to be a bit less displacement. You should get slightly more travel, so less drag, but a slightly harder pull. When you put it together and bleed it just make sure the slave doesn't overtravel. Gasgasman swapped in a 10.5 Magura so you should be fine.
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