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What you did was wrong. And What you did is wrong.

Again could these mean the same thing?

Or does was mean that it's no longer wrong 'cause it was in the past? And Is means that it's still wrong?

Thank you.
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In any normal situation, they mean the same, because right and wrong are relatively stable. If you wished 'was' to refer only to the past, the context would have to explain that wrong is/was now right. The difference in these two sentences is just that 'was' regresses with 'did'.
Comments  
Thank you Mister Micawber. I think I've been slowly but confidently putting the pieces together and it feels very satisfying.