True Track or True Heading?

Hello everyone.

I’m using both the AeroAPI and the track log in the FlightAware web site. The AeroAPI /flights/{ident} returns a (true?) heading while the track log indicates a (true?) course.
When sampling on different flights one can observe that values are the same for both sources. So, this is confusing.

Past discussions in this forum are out-dated and not always clear. Please, could someone clarify what is returned in fact?

Thank you.