Is there a difference?

Ev
This might be a silly question but, is eyeshadow primer and eyeshadow base the same thing? I own urban decay eyeshadow primer (works like a charm) and bought NYX eyeshadow base thinking it would work the same. Is it? I've noticed it still creases a tiny bit after long wear so I'm unsure now. 
​And, what eyeshadow primer do you ladies recommend? :) I wear eyeshadow & eyeliner a lot ?? 
​Thanks!  

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