I can confirm this just worked with the 1080p versions! I split the first part at 1:45:38 and split the second at 00:00:02 and then stitched them back together and it worked, seamless transition!
It's possible that a couple of frames on either side of the cut were removed...I'll have to play back the originals in a player that shows frame count, or import into Davinci Resolve and get them there, then do a more accurate cut.
Once the 4K ones come this week I'll try again and make sure that DV and DA are preserved and then report back.