Working at a Porsche/Audi store in Fife WA, USA and having been at the LA Auto show in person, I can personally state that the closest thing to the Macan is the Audi SQ5. Size wise, the Macan is 2.5 inches longer, 2 inches wider and the roof line is about 2 inches lower than the SQ5.
Interior space is practically identical. The Audi will have more room in the trunk area in regards to the overall cubic space, but only if the user stacks things higher than the top of the rear seats (not the top of the headrest) which will block your line of sight in either car.
If you have sat in any Q5, you will get a good feel as to how roomy it may or not be based on your own physical size and requirements.