True Comp Duplicator v3 is a specialized script developed by Mark Christiansen and available through AeScripts, designed to solve this exact problem by creating a "True Duplicate." It intelligently analyzes the hierarchy of a selected composition, duplicates (sub-comps, footage items, and assets), and rewires the internal links. The result is a genuinely independent copy that won't impact the source material.
If you change a text layer or a color in the duplicate, it changes in the original too. true comp duplicator v3 free download
[Standard Duplicate] -> Shares internal pre-comps -> Changing Copy A alters Copy B [True Comp Duplicator] -> Clones internal pre-comps -> Copy A and Copy B are independent Key Features True Comp Duplicator v3 is a specialized script