Just finished seeding/eating the green cherry tomatoes I picked a few weeks ago (finally ripened up).
There was a bit of a surprise. As I went though them, I found only three still had the dark green zebra like stripes, so I saved those separately. And, as far as I can tell, there actually IS a major difference between the two, both in size (the striped ones are quite a bit smaller than the non striped, small enough that the non striped of the same size tended not to have mature seeds) and taste (the striped ones are quite a bit more acidic, though not unpleasantly so*). So it think it is quite possible that, despite coming from the same initial fruit (I think) the two plants are NOT genetically the same, and the striped one is in fact a mutation or cross of Green Doctors (my best guess as to what the original was) rather than official Green Zebra Cherry. I don't have a lot of striped seed (besides there being only three fruits they were MUCH lower in mature seed than the non-striped) but I think I have enough to keep going.
*If you are wondering how I can save seeds AND eat the tomatoes, I wash them, cut them in half, squeeze the seeds and gel into a container to ferment, and eat the remaining wall flesh. I don't get a COMPLETE profile of the tomato's flavor (since I don't get much gel effect, being limited to whatever gel juice is left on the walls) but I usually get at least a decent idea.
Actually didn't get to eat much in this case, these were nearly all gel, very thin walls.