Thanks Greg for finding this out.
I have been playing a bit with the Carrick loop and the Sylvain’s knot is almost the same… the difference is that the running end is doing the final loop in exactly the opposite order (and that you have to capsize a bit the knot before tightening it). I tried to draw over the Abok diagram, not sure if this is clear.
I also watched Alan’s video. From what I understood, the right knot is the same than the Sylvain’s one. And the left one is almost the same, the only difference is the way the running part is inserted to make the last locking loop, by doing it on the loose loop side instead of the standing part side. But I may have missed something.
The test ended at 1120 kg, but is it because the knots were about to break ? or you did not want to damage your line ? It also seem it was a bit hard to untie.