Okay gents, here's the skinny:
I measured my Para Ordnance P14 mags in relation to the 97B's, and found that their dimensions are the same in terms of height and depth, and the P14 is only 3/32" wider, yet, the P14 mag holds 14rds to the CZ's 10. Another factor is that the P14 mag tapers more abruptly at the top than the CZ.
I'm a bit disappointed- it seems that a very slight design alteration could have given us four more rounds!