SaltyCracker, those two bends are almost completelly different !
( Well,
almost as different as two interlinked overhand bends can be...). And I think that yours, ( the one based upon ABoK#1031), is better !
1. The tail of each link is secured by the unobstructed, direct pull of the standing part of the same link.
2. The last gripping action of the knot on the tail, before it exits the knot s nub, is probably tighter than the previous one, inside the knot s nub. So, the tail is tightly fixed, mainly at the last point of its contact with the knot, and then the remaining portion of the rope, between the tail and the standing end, is closing tighter and tighter around the central core as we continue to pull the two ends/knots. That would probably lead to a tighter, and more compact, knot form.
I would suggest a test of those two bends on the most slippery material you can find - on oiled monofilament fishing lines, etc, - and see if there are any notable differences.