If you look at a Standard, and in particular how far out of the body the bridge and the bridge pickup has to sit, you'll see there's a difference.
Edit - it's quite hard to find good pics to show what I mean!
I've always wondered why the neck angle on my SGs is quite so steep. They've all had the bridges sitting very high on the body.
There's still a fairly substantial angle on the '61 though, as can be seen from the heights of the pickups and their mounting rings in your pic.
I wonder if the neck angle is "officially" any different between the two, or if it's just a case that more care and attention (and therefore cost) is needed to get it
just right?