The two mags that came with my Tristar were marked "Mec-Gar" and Mec-Gar is the OEM manufacturer for cZ magazinews. When I did a side by side shooting session with the Canik and the cZ Compact, I swapped the magazines between the two pistols and both performes flawlessly. I purchase Mec-Gars for all my cZs, compact and full size.
Not having an EAA at the time, I cannot comment on magazine fit, however, I have read that there can be a problem swapping magazines between EAA and cZ,