And there is the trick. The fact that the stock bushing doesn't protrude from the slide while the 10X bushing does is an important detail that was omitted. It doesn't just show and look a little different. It lengthens the pistol and changes the contour.
I don't know about your CZ's but my (3) CZ85Combats, Rami, P01 & my 1985 CZ75 all protrude from the slide and all by different amounts.