Want to switch my sons pacifier brand but afraid of nipple confusion?

at the moment my son is used to a few different . my own (he is fed), his bottle for when im away( first years " flow" bottle, which is supposed to be very much like the human nipple) every once in awhile ill give him the playtex drop in bottle and he also uses the playtex ortho-pro pacifier. i want to change his pacifier to the advent brand but im afraid to give him nipple confusion. if i completely replace the playtex pacifiers for the advent ones do you think it would be ok?