audits and mystery shopping are pretty intertwined... a significant number of mystery shop assignments have an audit portion first and then reveal...
merchandising is usually dealing with placing products/displays out on the floor...
however the larger companies do a mix of both if they are employed by a number of companies... for instance one of the walmart contractors had me place movies on display and then go around and check and make sure that disposable shot glass cups were with the soda displays
shopping north west PA and south west ny