I have not owned a CZ 97. However it is based off a 75 which is a distinct design more similar to a brownings highpower than brownings 1911. The mags may possibly be identical to those used in a high capacity 1911 design, although these are not standard either. Kimber uses a different high cap mag for their 1911, than springfield and para. Basically I don't think any of the parts would be interchangeable with a 1911.
The CZ 75 and 85 are well regarded, I don't know about the reliablity of a 97 though.
What does "gauge" mean anyway? As used here gauge means the number of round lead balls the same diameter as the inside of the barrel (aka the bore) that it would take to weigh one pound. It takes 12 lead balls the same diameter as a 12 gauge barrel to weigh a pound. The smaller 20 gauge would require 20 balls of that barrel diameter. The larger bore 12 gauge would require 12 lead balls of the bore diameter to weigh one pound.
In general the number of pellets in a shotgun shell...