I haven't had to buy recoil springs for a 97B or a 75B-based gun in years, so some of this may have changed.
When I was shooting CZs a lot, the Wolff CZ springs were really NOT CZ-spec springs, but springs made for the Tanfoglio version of the CZ design. The Wollf springs had to fit the larger diameter Tanfoglio/Witness guide rods, but they worked OK in the CZs.
Springs for the Browning High Power seemed almost identical in size/diameter as the CZ factory springs and offered some weights (including a variable rate spring) not available for CZs. That's all I've used for the years that I was shooting 75Bs and my 85 Combat. (My CZ and CZ-pattern gun collection is much smaller, nowaday, but I've still got a parts bin with a variety of both diameter recoil springs stashed away.)
If nothing has changed, and you're using a stock guide rod and a WOLFF spring, it's not going to fit the recoil spring tightly; if so, you will see and hear some rubbing inside the dust cover and see marks on the on the underside of the barrel.