I've seen several for sale on the internet that didn't have the right side slide release. Must have been ordered that way for some reason. Ambidextrous safeties on those vs. the CZ75.
Here's a CZ75 Compact I added both a right side safety and right side slide release to. And a spur hammer, so it looks more like Pre B CZ85.
I bought a CZ75B in .40 S&W a few months back. They come with the ambidextrous safeties. All I had to add to it was the right side slide release (actually I had to buy the left side, too as the CZ85 left side slide release is made slightly different on the right end of the shaft) and the spur hammer.
The CZ75 Compact mod. was definately the more intense of the two. The CZ75B .40 mod was pretty quick/easy in comparison.
Thread here, I'm not sure where, on the CZ75 Compact project. I struggle with the search function and sometimes just don't find what I'm looking for. I will take a look to see if I can find a link to it.