Squash are notoriously promiscuous and rarely breed true. You might get plants coming up from the seeds you scatter, but the edibility of their fruit will always be a surprise.
The angel hair squash (not really a squash) is in a different species Cucurbita hederifolia, and it cames true by seed.
Maybe the yellow skin could turn more green and splotched like the wild species, but is basically the same in terms of edibility.
Is also one of the pumpkins that can really last. You can store the beautifully yellow mottled green fruit for more than four years in a dry place. It it was pick carefully, will be perfectly edible still after this time. Wouldn't try the same with a Cucurbita maxima.
