I believe both of your cartridges are high-ouput MM, which does make sense given that Macintosh usually has a MM phono stage. This means that many of the MC cartridges are probably not going to work for you without the addition of step-up transformers. I don't know Mac gear well enough to know if they offer a MC phono stage.
I wouldn't worry too much about trying to get the low compliance as much as perhaps looking to add some gain to your phono stage if you are wanting to try MC cartridges. (Your cartridges are around 15 so that should qualify as medium compliance.)
I wouldn't worry too much about trying to get the low compliance as much as perhaps looking to add some gain to your phono stage if you are wanting to try MC cartridges. (Your cartridges are around 15 so that should qualify as medium compliance.)