Approbate vs Validate - What's the difference?

As verbs the difference between approbate and validate

is that approbate is to give official sanction, consent or authorization while validate is to render valid.

is approved.

(en adjective)

approved

* 1531 , Thomas Elyot, The Boke named The Governour

And if they wyll allege that all thynge contayned in holy scripture is approbate by the hole consent of all the clergie of Christendoms

(approbat)

To give official sanction, consent or authorization

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(validat)

To render valid.

To check or prove the validity of; verify.

* disprove * invalidate