I don't know if they are. However, I think the ones used for the salt and oregano are the same size. Look at Luigi's hands. You'll see it's not a smallish bowl and he holds it with two hands.
I also measured mine: 6" diam. x 1.75" height. The bottom is 3.75" diam. if that matters.
I thought that the bowls on the table to the left of the mixer were smaller than the ones used to make the sauce. However, I concluded that camera angles and distance from the objects might make it difficult to compare sizes and dimensions and maybe even distort some of the values. So, I decided that we needed a better system. I think I found it.
This is what I did. I went to a local supermarket and purchased a one-gallon jug of Crystal Geyser spring water. You will note that the water jug, the cap and the bowls appear simultaneously in several frames of the video, especially the cap and the bowls. I measured the width of one side of the water jug and it is 5". In fact, all sides are 5". The cap is 1.5" in diameter. I then went to several frames in the video (I would say at least six or seven frames) where the water jug, cap and bowls appeared (there were a lot more frames where both the cap and bowls were together) and, using the zoom feature of my computer, I blew up the images by 400%. I then took measurements off of my monitor, calculated certain ratios, and using the actual values for the water jug and cap, I concluded that the measuring bowls on the table were 5" in diameter (4.999999+", to be exact). I got the best set of numbers using the bottle cap and the bowls rather than the water jug itself and the bowls. There were fewer joint appearances of the water jug and the bowls and, while the sides of the jug are square, the corners are rounded. So, I wasn't sure that I got the best measurements for the water jug. Also, the cap and bowls were often right next to each other.
I then decided to go through the same exercise as discussed above but with the bottle cap, a bowl and the mixer all in the same frame. I wanted to see if I could determine the size of the mixer bowl. A good frame for this purpose is the one at 1:42. From my measurements from that frame, I calculated a diameter of 21.56". The diameter of a Hobart 80-quart mixer is 21 11/16". However, I couldn't get a good reading of the height of the mixer bowl to confirm the bowl size. So, while I would tend to guess that Luigi is using a Hobart mixer with an 80-cup mixer bowl, I am open to a better answer.
The measuring container that I was using to weigh items is about 4" in diameter. As time went on and I learned more about what was actually happening in the video, I could see that my numbers were on the low side. I plan to wrap a ring of cardboard around my container to increase it to 5" in diameter and re-do my weighings. I know my new weighings should be better even if they aren't perfect. I am trying to just get into the ballpark.
In your case, Mike, it looks like your bowl is of a good enough shape to do some weighings but you may want to mark off the 5" mark if you agree with my analysis. When I saw your photos next to the ones with Guy, I suspected that your numbers couldn't be right because you were wearing a different shirt than Guy