Interesting, i thought the magazines were different between the old p10c and the new p10c. is that not the case
They were. OLD P10 used ambi mag release, NEW P10 uses swappable mag release.
Most magazines sold now will work with both. If you are not certain, just buy from Greg Cote where they clearly notify:
"THIS IS THE NEW STYLE CZ P-10 C MAGAZINE MADE TO WORK IN THE ORIGINAL CZ P-10 C AND THE NEWER VERSION"or use part number from their site and search for it.