Really reaching in that last one. If we're counting covers that have similar concepts but no shared design elements or character poses, we could count all of the villain-standing-over-defeated-hero covers. And there are a lot of 'em. (Still, if it's Romita Sr. and Jr. it's worth pointing out they did the same concept on ASM covers!)

Or all the current Marvel "Stock character posed to tell nothing about the story" covers.

Somewhere between "The greatest comic cover ever" and "The peak of Western Civilization?"

(I really like that cover!)

That one definitely counts!  

The other one.. no.  

We have two covers with the same characters interacting the same way.  The cover concept is the same... but homages aren't about concept, they're about design.  It's not about character and story, it's whether or not the covers use the same shapes in the same way.  

And the Romita and Simonson (Simonson?  Really?  Man, it's true but I don't see it!  I always expect Simonson's stuff to look like Manhunter)  don't have Spidey posed the same way, the "camera" angle is different (with the Simonson being further away and straight on and the Romita cover being foreshortened and askew) and the fact that Romita's cover is based around a circle motif while Simonson doesn't actually draw any circles at all.  Speed Demon is running in a circle, but the actual shape is a rectangle.   

And, more to the point, they're both "Super-fast character running in a circle and leaving after-images" 



So they're both almost certainly referencing (not swiping or homaging!) Carmine Infantino.  

GCD says the Simonson cover was based on a sketch by Ed Hannigan.

OK this is a weird one.





So that's the cover of Detective Comics 33 from 1939.  It should be fairly well known today in the era of reprints, fanzines, internet, homages, etc, but why is it being swiped in the fourth panel of this random issue of Batman 117 from 1958?


 

When Moldoff drew this issue he almost certainly had to have an actual copy of Detective 33 in front of him as reference since in 1958, I can't imagine that it had been reprinted anywhere.  I guess he had access to the issue as an employee of DC (or perhaps Bob Kane had a copy laying around) but it's still strange to think that he was either carrying this image around in his head for close to 20 years at this point, or was rooting through the archives at National Periodicals so that he could get an idea for panel four, page ten of one of the three Batman stories he drew for this issue.