Round bolt looks like an MP38/40 or variant such as a Portuguese FBP. Like Tiriag said it could be a Star Z-45 since that had a selective fire capability, the firing pin hole in the bolt face makes sense.
Rectangular bolt looks like FN FAL/L1 or SAFN49. Does it have any Caliber marking on the extractor? 7, none if for 7.9 & 7.65, 7 &30 marked.