Well to start, no rifle is ever like another one of the same make, they all seem to look and operate differently in their own way.
One good example I have is when I had two Gewehr 71.84s that were only a 1000 units off from another from the same maker and year which was roughly a day or two on the production schedule. Both looked and operated quite differently.
Do they Ljungmanns have provision for a cleaning rod ? If not, then you know why yours doesn't have one.
The brass disc was likely removed by a Swedish armourer, is the hole filled in with a wood plug ?
I'm also not sure what you mean by "mark on the butt from storage". If you mean handling marks from being in storage crates then the answer is probably yes.
Has your stock been sporterzied by chance ? I have seen a few Ljungmanns out there owing their new look to bubba.