Seeker > 620 KC

Hey All, I need your guidance please. Years ago I pulled a trans for a backup for my 200SX, or with a housing swap for my 79 620 KC. It is approx 32” long, has the top bell housing bolt hole to the right of the top ridge line in the shorter bell housing boss line, and is stamped ZL 71B. Unfortunately, I didn’t record, nor remember what vehicle I pulled it from. I think I recall it coming out of another 200SX. But I’ve salvaged so many, it may have come from a 720. (Note to self: Lesson learned, tag or label parts immediately upon sourcing.) Looking them up on the gearing chart, it may be one of 3, with different gearing depending what year 200SX it was? Is there a way to identify which gearing it has, and what vehicles it will interchange with? (Housing circumstances are quickly changing and I need to sell it, and possibly both my Datsuns. )

Need to liquidate the ladt of my 520/521 parts https://sandiego.craigslist.org/nsd/pts/d/carlsbad-datsun-521-parts-reduced/7656036997.html

Need to liquidate these left over 720 parts https://sandiego.craigslist.org/nsd/pts/d/carlsbad-datsun-720-parts-reduced/7656039503.html

These are mime, need to liquidate a jandful of 320 stuff https://sandiego.craigslist.org/nsd/pts/d/carlsbad-datsun-320-parts-reduced/7656034123.html

These are my 620 parts https://sandiego.craigslist.org/nsd/pts/d/carlsbad-datsun-620-parts/7648721348.html

I have a couple 2 piece drive shafts i picked up in a pile of parts. One is supposed to be 620mlong/short? the other could be 620, 521, or 320? Does anyone have the lengths of the drive shafts, or a way to ID them? Are the spline counts specific to the diff models?