Good Observation, but As I remember they said it was Quince, and I think it was a larger tree smaller fruit,
I know the Nursery name it's at my home so maybe on Wednesday or Thursday I will know.
They are passionate about seed growing, and letting the tree's adapt (okio's It sounds like)
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Oh I guess that was it.
https://oikostreecrops.com/https://oikostreecrops.com/products/?route=product%2Fsearch&search=quinceBy the way Want to try to grow those japanese quince you mention (maybe make hybrids , or use as rootstock
When I was a little younger (early 20's) I saw one a block away 2 feet or less tall
actually had a thorn in the fruit (not sure if it was stuck in it or grew out of it)
I didn't prepare it right Now I like quinces because they dry easy, and store better then apples
makes great tea along with those tiny (marble sized) crab apples no on cares about.