thorn length may be influenced by rootstock, but i only have anecdotal evidnece from what have seen on some juju grafts. The pictures posted by nmsu as qiyue xian, which was renamed and trademarked as alcalde, look exactly the same as that of the qiyue xian trademarked as autumn beauty by ogw.
i actually think they are the same, primarily because the long and distally tilting thorns are unique. Have been watching juju thorns for many years(all >70 cultivars of them) and haven’t really seen anything as distinctly stereotypical as the forward tilt of thorns that are ~1.5" long or greater. For two sources to sell or post pictures of a cultivar exhibiting just that, and both of them with the chinese name qiyue xian that bear similarly sized and shaped fruits, i will have to conclude both claimants trademarked the cultivar qiyue xian as autumn beauty and alcalde.
of course, it is possible that the “true” qiyue xian has short thorns, and that the pics at nmsu website were posted by mistake(probably posted ogw’s qiyue xian with the distinctive thorns).
conversely, also posible that ogw’s qiyue xian with long thorns is the real deal, and that alcalde is not the true qiyue xian but actually another cultivar with short thorns, just like the tree you already have which has tiny, if not negligible thorns
below is nmsu’s webpage with the picture i hightlighted above. The first entry Alcalde being aka’d as qiyue xian
https://aces.nmsu.edu/jujube/eating.html
