No, they are not. It's very easy to see, the depth at the bottom of this deadlift variant shown is not identical to a below-parallel squat. This is really just a less efficient sumo deadlift. The stance is in a little bit from what is usually done for sumo, and the arms are crowded in as a result, leading to one awkward looking lockout. Honestly, with the arms in like that and the elbows in front of the body like that, it could put the elbows in danger if you use heavy weight. The premise the guy explains for the benefit of these is also flawed. Conventional deadlifts and squats have enormous amounts of carryover between each other, no modifications necessary. This is why starting strength only uses a single work set for deadlifts. Squats, especially the low bar, share a lot of stresses with deadlifts, particularly the low back. I've actually been able to sustain volume deadlifting and get a good training effect from it during a period where I wasn't squatting heavy. But once the squats started to get back to being heavy, the back was getting overworked. I did not watch the second video, but I would encourage a lot of skepticism from any lifting advice given by the man in the first one.