That's what I do all day too.
Raw (along with canned and homecooked) have to be converted to a dry matter basis to be able to compare the protein % with kibble. Divide the protein by the reciprocal of the moisture. If it is 13% protein and 70% moisture, then it would be 13 divided 30 (100-70). If it is 15% protein and 75% moisture, then it would be 15 divided by 25 (100-75).