A bore snake for .357 and for .38 special should have identical dimensions, so if you see one or the other, grab it - it should work. Failing that, look for something in .35 or .36 caliber.
I want to say they make different rifle and pistol lengths... however I have used my .45 pistol boresnake in my .450 Marlin with an 18.5" barrel so I think you should be ok lengthwise.
I use the same bore snake for my .44 mag revolver and rifle, as well as the same .22 bore snake for my revolver and rifles. My .44 rifle is a 20" marlin and the weighted end of the bore snack hangs out by a few inches when fully inserted.