You sure can do cardiology after going to kcom. However, I don't know of any list that you can look at stating where a person matches to for cardio for the following reason.
Cardiology is a fellowship that is done after the Resident does 3 years of internal medicine. Therefore, any recent budding cardiologists will only show as having matched to internal medicine residecies. They then have to complete their residency and apply for cardio fellowships.
I know there are KCOM grads who are cardiologists because, one of my professors at KCOM is a cardiologist (taught us our cardiology section in IM). Secondly, I know a 3rd year resident who graduated from KCOM and who did his residency at KCOM who will be doing his cardio fellowship at the University of Missouri in Columbia.