anybody know is any difference in O2 sensor position in downpipe?

mine second sensor(as first are before turbo) are in downpipe after cat. i get another downpipe(as mine are to much rusts and holes) in this downpipe O2 sensor are before cat.

so any differences in which position is sensor?

PS my car is MY95 wrx jap import

 

On bugeyes the first sensor is in the up-pipe with the second after the cat, on blobeyes the first sensor is on the downpipe just after the turbo. Not sure what classics are like but it does show that they are all over the place.

 

my car has two first in uppipe second in downpipe. but main thing i am interested in second sensor position in down pipe it makes any difference or not?