Heading implies "right now", where headed gives you flexibility on time. But both are correct
July 17, 2013
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I'm heading home ( right now )
I'm heading for a meeting right now.
I'm headed home ( maybe now, maybe hours later)
I'm headed to London ( today? tomorrow? or in a couple of days)
July 17, 2013
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I'm headed home
November 15, 2019
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both are fine.
July 17, 2013
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