On the mellon air sight it says they work the same. I like the long probe bolt but it will give you less room in the loading port. The breech and bolt combo did improve accuracy and velocity.
I have no test results for a 22XX.... However, on a QB in .22 cal that was converted to HPA I first drilled out the flow through bolt as large as possible for maximum flow and it was shooting 871 fps.... When I converted to an extended probe bolt I picked up 32 fps to 903 fps with no other changes.... I didn't notice any difference in accuracy.... Bob