At no point did I suggest the movements were entirely different. I said they were variations. Most (not all) of the muscular movements that tennis pro uses for that odd shot are in her basics. They're combined in a different way and added to a couple of unusual movements to produce a variation. I do the same with some of our takedowns, and certainly with some of our pins.
See, "block" and "move" are basics (you may recall that blocking was the actual example I used earlier in this, where I discussed a progression). You can train a few variations of those (I think we train 6 blocks, off the top of my head). But variations on those movements are useful, too. They'll train some of those variations in drills (as entry to techniques). And some, they'll just "discover", long before they are trained to them. I "discovered" our cross-arm throw while training as a blue belt, I think. I didn't learn until about 2 years later what that thing was. To me, it was a natural variation of a set of upper-body movements from one technique, with the lower-body movement of another. Neither was quite the same as they'd been trained, but when fitted together in this new combination, they worked. It wasn't a discovery of exploration - it was something I just did. And that's not something unusual about me. I had a training partner make the same discovery, at about the same rank, working with me a year or so later, and I assume there have been others who wandered into "new" territory by following the training.