Different 1570 movement, Sports and DJ?

[Fredrik]

Hey,

I was always under the impression that in the old 4-digit Rolex watches, like a 1680 Submariner and say a 1601 DJ, the movements were slightly different.
This is visible in the two shots here, the DJ movement has a bevel on the dial side on the plate.
There is a thread on VRF now were someone is looking for a movement for a 1675 and asking if a DJ movement would do it. Even if fitting the needed parts for the 24 hour hand, it would still be obvious that the movement isn't original, wouldn't it? I assume this is not a part easily obtainable?