It could be pretty bad for the revolver. Don't do it. I don't know if they would fit in the cylinder, but even if they do, the .38 Special works at higher pressures than the .38 Long Colt.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.