No you can not. The left grip will be bigger in the inside diameter to accommodate the throttle tube. Also twist throttle grips have a taller inner thumb rest that would interfere with the thumb throttle lever.
The original grips are the same diameter of grip all the way through. The tapered grips basically go from being the thickest at the inner part of grip and then taper down to a standard size grip more towards the end of the bars.
orig. is a grip that is the same diamiter all the way from the flange to the end.
tapered is smaller at end and bigger at flange to make a better fit with your hand because your palm is bigger than your index finger area. hope this helps