Question for MG42 experts

Hello men, hope some of you can identify the difference in some of these parts for me. I have a couple of extra bipods and top covers that are manufactured differently and I was just curious as to the history or country of origin of them. Pictures follow. the first picture shows two bipods, the only difference that I can tell is the nut that changes the leg height when turned. One is grooved deeply with what looks like a ball nose end mill, and the other is knurled. Next to the sheet metal, where the one on the right is welded. The one on the left also has an egraving of what looks like a wreath of grain ending at the top with a centralized star around a group of burning torches...a banner under the torches says 29XI 1943 below the engraving or more likely stamp, is C (german semble of some sort ) PJ and L-36369. Where is Captain Kirk when you need him