there is a difference between the two.
quick detailer is intended to be used in order to give the car a quick spruce up to remove very light contamination or to be used a lube with clay, it's a spray and wipe product, and offers no protection to the paintwork underneath. you don't need to apply a wax everytime you wash the car, so the quick detailer can be used at the end of your drying in order to get rid of any little watermarks and also add some shine.
whereas the spray wax does give some protection, needs to be buffed off when applied and should definitely not be used as a lube when claying the car.
hope that helps.