Agree. I have also done both roles. The liaison position was a sales/marketing type role. You will work to build relationships with the referral sources, so that you bring in business. I had to continually meet my metrics ( certain # of contacts with my referral sources and # of referrals brought in). I liked relationship building but it was also a lot of meetings about business results and who are you going to see today?
In the hospital case manager role, I met all the new admissions to my floors, figured out their needs and discharge plans. Also set up services such as home health, O2, dialysis if they hopefully had coverage.