you can. I do it a lot. Ive gone from hydro(clone) to different hydro(veg), then dropped a reflector on it splitting it in half, vegged for awhile given to a buddy who put it into dirt, we relocated our grow, put it back into hydro, as were doing this my friend accidentally stuck the top in the exhaust fan(new topping method
), then after a few weeks we decided to revert back to all soil cuz that was the only one left in our ridiculous hydro setup. It looked like crap, and didnt yield a lot, but it lived. Im sayin you can do it, just be easy with it.