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Ctrl+Alt+/ will replace a source for a selected layer in the timeline with a selected source in the project panel . Make sure they are both highlighted.
Is this what you were looking for?
Thank you very much. Yes that is what I was looking for. Very good Keyboard Shortcut
you're welcome. Yep very useful indeed and I use it constantly. You have to when you duplicate precomps and want to make them unique. Useful for other scenarios too and much faster then alt+drag to the timeline.