Can I make a Find my iPhone account on a 4.2.1 iPhone 4 and use it on a 4.1 iPhone 4?

Can I make a Find my iPhone account on a 4.2.1 iPhone 4 and use it on a 4.1 iPhone 4? Thread title, thanks.

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Source: http://www.xdadroid.com/2010/11/30/can-i-make-a-find-my-iphone-account-on-a-4-2-1-iphone-4-and-use-it-on-a-4-1-iphone-4/