If a diet ends up with little enough weight loss that you'll just bounce back to the same weight, the changes are small enough that I really doubt you can reliably say much about change in muscle mass. For me the bounce back at the end of a diet is pretty much always ~2kg, so a "loss" below 2kg is really not an actual loss, but easily accounted for by less fluid retention and less food in my system. Yes, you're likely to lose some, but again I'l stress: not much for it to matter much for most people. Especially when the point of comparison is not doing nothing but just dieting slower. You'll lose muscle mass while dieting slower too. I've seen little to indicate there's a particularly meaningful difference in proportion other than for pretty advanced lifters for whom a "meaningful" difference in loss is much smaller than for most people.
When I was pushing my body to the max every week, then the difference mattered to me too. But most people are not there, or anywhere near those kinds of limits.
When I was pushing my body to the max every week, then the difference mattered to me too. But most people are not there, or anywhere near those kinds of limits.