Let's face it, most in demand GA covers feature similar scenarios, especially when they're drawn by Alex Schomburg (but by no means only him). The difference being that Suspense 3 was first, although certain pulp covers would've been an influence.
All that's required apart from a damsel in a flimsy dress in bondage in a pit of some kind (or a glass tube) being rescued in the nick of time by the hero from snakes, fire, swords, axes, hypodermic needles (usually wielded by mad scientists or dwarfs) etc. is the presence of hooded Nazis or secret society goons and perhaps some other indistinct weirdos and the obligatory executioner added for local colour. Hitler with an oversized green head optional, of course.
And voila, the poor man's Suspense 3.
Don't get me wrong, I love all that stuff. I definitely want every single variation of that theme ever printed in the GA, including that icon book.