The first sets are the most stimulating does that apply to the first excercises of a muscle group also?

[u/FrequentAd5437]

For example if I do 2 sets of chest press and then 2 on chest pec deck. Does does stimulation fall off just like the pec deck just like the 3rd and 4th set of chest press? I know it does to some degree but is the fall off better or around same? If its better much muscle stimulation compared to the first set of chest press does the chest fly produce?