old colonel,
They are different, both can be reloaded without too much trouble. One of them is pretty easy, even jacketed bullets can usually be made from 44 bullets.Since it comes with dies, I would expect there are some cases laying around also.I believe both of these are smokeless cartridges.If the rifle is in good shape,I would jump on it.Don't worry about loading data, maybe people will ask you for data later.
Mike