I usually run my 16” in clamshell in a Brydge vertical dock, but one of the first things I noticed besides it being fatter/heavier (almost 3/4 of a pound heavier than my 15” 2019), were the side vents. The top of the Apple Silicon MBP vents are cut right above the curvature of the case resulting in a sharpness to them. The Intel MBPs have a bit of a chamfered edge above the top of the vents rather than meeting at a sharp angle. I don't recall the wife's MBA having this issue, but she's not home at the moment so I can't confirm (but sounds like this isn't the case with MBAs).
View attachment 2633391