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Two container versions, two config files, two exports: what changed is usually three lines out of two hundred. This comparison finds them line by line, in the browser and without an upload.
Update — 19.10.2026: A text difference describes the supplied text, not the executed measurement. Identical GTM exports do not archive Google's runtime, and gtag.config events can affect existing wildcard triggers without a local edit. Central optimization settings, destination routing and permissions need a separate review. The prefilled JSON values below are comparison examples, not installation snippets or instructions to issue config twice.