Not really... You see they took their creation from Philip Wylie's pulp novel Gladiator. In that book our Hugo Danner had super strength, bullet proof skin and was able to leap tall buildings. He lived in a small farming community and pretended to be mild mannered to hide his secret identity and protect those loved ones.
DC Comics also has the Green Lantern which was a Creative Re-imagining of E.E. Smiths The Lensemen. Also, The Batman who's lineage is from Johnston McCulley's Zorro.
Not to say that DC comics has the lock on plagiarized characters. Marevel Comics X-men took from DC Comics The Doom Patrol quite a lot.
Also, Disney's Lion King has more then a passing resemblance to Kimba the White Lion.
Does it really matter? No, but I would say the source material deserves it's place in the sun.