Sounds like I'm not the only person who's been saying that these two are pretty similar. I think he's actually comparing the blue 053 to the black 061, not the 063 as he's stated there....but I need to double check that.
Per the video, the differences are:
1. Shape of the case
2. 053 has the domed crystal vs. the newer 06 series which is flat
3. shape of end links (to fit the case)
4. hour markers