Guarantee vs Granted - What's the difference?

As verbs the difference between guarantee and granted

is that guarantee is to assure that something will get done right while granted is past tense of grant.

As a noun guarantee

is anything that assures a certain outcome.

As an adverb granted is

Used to concede a point, often before stating some contrasting information.

As a preposition granted is

used to mark the premise of a syllogistic argument

Granted that he has done nothing wrong, he should be set free.

Granted the lack of evidence, we can make no such conclusion.