If your timing belt pulleys have the rounded valley notches (a 93 should), then it needs a belt with rounded teeth. The notch that belt tooth rides in is not a subtle difference. The bottom of the late gears is half-circlr shaped at bottom and the early style is flat and more shallow. The belt tooth is supposed to have contact to the bottom of the corresponding notch in gears. The pitch (distance from tooth center to tooth center) is the same. The problem is wear and resultant loosening of belt will result in the edge of the flat tooth wearing. The teeth on belt are dragged by the notch in gear. The design intent is to have the tooth going to bottom of notch. You have time, but yes, you will have to put the correct belt on it. To assure that it doesn't go anywhere in the mean time, remove rubber plug over the tensioner nut and loosen the nut (16 mm on that yr, I believe) a couple of turns and then rotate the engine an 1/8 turn clockwise to assure the belt gets tension on drive side and all slack will be taken up on the backside where tensioner is located. Now the belt is as tight as is reasonable and it will not have any tendency to have a tooth attempt to walk over the gear notch/tooth. IF you ordered belt from IPD and the correct model year was provided to them then you need to have a conversation with them as to why the wrong belt was provided.