i am no expert or gunsmith,but they would have to be different.if you look at the barrel when it is taken from the receiver,the rh has the slot for the ejector on the right side.a lh would have to be reverse of that.the barrel cannot be turned over,it is designed to throw the shell out the right side.the bolt,barrel and receiver would have to be reverse.the stock and forearm would be the only interchangeable items i think.