You can not mix and match compressors. Even between GM compressors as the belts will not align. In addition to Harrison A6 axial six piston, Harrison also makes the R4 scroll compressor and the HT6 (similar form factor to the Sanden scroll compressor), then there are the York compressors (looks like a miniature Harley V-twin engine, and Fords compressors. None have the same bolt patterns, form factors or share brackets.
Ok, I was just going by what they allowed as substitutions. A few different compressors and pully configurations. They make the brackets custom for your engine as well. .