All of those things are the loving same they are just reskinned. Are you dumb?
Except they're not
Crimson Armor and Shadow Armor have different set bonuses and some items in a "tier" are more powerful than their counterparts, among other things
Not to mention you can't use any bricks or blocks related to ores not found in your world without generating a new one
er
i guess delete wasn't the best term
stop using?
So basically you don't want to start over because you don't want to play without the best items in the game?
Ultra-lame