That makes a lot of sense, practically and scientifically, and seems to be pretty much the consensus:
ephedrine/caffeine = stronger norepinephrine response, so naturally a stronger stimulant and a better appetite suppressant, but not a great actual lipolytic (fat-burner).
H.E.A.T. = more balanced NE response compared to elevations in dopamine and adrenaline/epinephrine, so a better lipolytic and a more benign 'stressor' of the body's adipostatic machinery, but less of a stimulant/anoretic supplement.