I've got the same one, I'd been using just the jig, which has been working fine, but decided to grab the protractor to double check, they match every time. This protractor, I believe, mirrors what the jig represents, which is 1200's alignment, which, is unique. If you look at the numbers on the protractor and compare, you'll see they're kind of off on their own.
Baerwald - 66.0mm / 120.9mm
- Attempts to make the distortion even across the entire record
Stevenson - 30.325mm / 117.42mm
- Attempts to minimize inner groove distortion
Loefgren Alignment - 70.3mm / 116.6mm
- Attempts to minimize distortion across the entire record
I've been happy sticking with the manufacturer's physics.