From @m1lkshake227 :
If you just want TTK buy the $40 version, if you want TTK and the shader, xp thing, and class mods but don't want to buy the $80 version, buy the $40 version and pay the extra $20 for the stuff. But if you want the other stuff in the physical collectors edition, TTK, and the digital stuff, get the physical $80 version. I hope that helped you. :)
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I can't mark my own comment as the answer, but this is the answer.