The only thing that really keys a barrel to the receiver is the alignment mark and the digit on each, the barrel is not serialized, the big number on the barrel is a lot or manufacturing number, not a serial. Technically you would never know, they could have stamped a single digit on a new barrel to match it to the receiver.
Most Romanians are mis-matched, at least 90-95% are, from one part to a complete and total mis-match, to find an all matching one is very uncommon. Like I stated, mis-matching is normal, especially the stocks followed by the top covers, the box mag could also be, but usually due to bubba shoving a duck bill in it and losing the box mag.
Condition wise, it looks good, again, this can vary from little to no bluing, almost in the white, to a nice deep dark blackish bluing, like matching numbers, metal condition is all over the place.
My most mismached ugly duck Romanian shoots and functions as good as my matching Romanian