I've found this to not be the case. I even measured the 3 Polo RL button down shirts vs the 4 D&S button down shirts. On average the D&S shirts measured 1" less in the chest.
Sorry for introducing actual data into the discussion!
Which model & which cut? I have a few dozen work shirts from RL and they all very drastically depending on model and cut, even with in a single product like (RLBL, RLPL, RL Polo, Blue Label, ect....) The other factor is "made to tuck: or "made to be un-tucked"
Same works, same workers line @ the plant in China. Now you're just talking to talking, I personally own multiple shirts from this line and they are at least the same grade quality if not better then normal RL Polo shirts. Black Label is a notch up, RRL is also an notch up & Purple label is several, but this is made by the same people on the same machines as every piece of RL Polo that comes out of China.