Pretty much just like the title says, are the ETA-2824 and ETA-2804/1 movements completely interchangeable in a watch. E.g. if I bought a watch with an ETA-2824, but wanted to swap it out for an ETA-2804 would there be any problems doing so? They have the same diameter and seem to have the same mounts, but the 2804 is slightly thinner.
They're identical except that the 2804 is missing the automatic winding bits.