My butcher saved the fat trimmings from their beef cuttings "they specifically said no pork in them" but I got to some of the meat slabs and I'm kind of questioning what it is. I took pics and asked someone who might know, but they couldn't tell. I tried cooking 3 different pieces, each with some fat and some meat on them and tried to smell them but that was dificult as the smells mixed. Once cooled the one did taste a little more like bacon fat but not nearly as "good" What I am seeing a difference is the meat on the right, the two larger slabs. The reason I need to know is I'm rendering the fat for use in various things and some CAN NOT have pork fat as it reacts very differently due to the fatty acid composition and will ruin the product. Are there any experts here that can tell and or any suggestion on how to tell and what to do? I have like 20 lbs of this..