Analytics on a separate account from Adsense

We have a website that uses Google services and we have a separate Google account for it, including Analytics.

We have AdSense on another account. Can we deploy the codes to the site that is under a different Google account, or do Analytics and Adsense have to be under one Google account for the earnings to work?

Is it then possible to link Analytics from another Google account in the AdSense administration for better statistics?