Would a 69 6 lug 12 bolt rear end be the narrow one?

[7T2]

I'm looking at one on ebay, and I'm looking for the slightly narrower rear end. The one I'm looking at is out of a 69 SWB 4X4 truck and is a GM 12 bolt with 6 lug axles. Not sure if I can get out to measure it myself before the auction ends. I asked seller to measure it, but there are so many different ways to measure that you never know if someone is measuring the same way you would.

Just wondering if ALL 6 lug rear ends were narrower than the later 5 lug ones.