need help wondering if this is possible

if a server owner gave you his UUID could you changes yours to his an join back an gain OP?
minecraft wanted security UUID makes sure its them so alt changer + uuid change = WIN AT LIFE
but most server dont have cracked enabled so i wonder if you can just change your UUID an join back an have op

xD GG OP.
First: You can find anyones UUID, the owner doesn't gave to give it to you.
Second: Any 1.7.10 + servers have UUID, cracked or not.

Learn about servers before you even try to "hack"

You also postedib the wrong section.