I would say they are similar but the focus is more on controlling everything through Git rather than IaC which leaves this ambiguous and can require updating the Git repo and then visiting a dashboard to press a button to check the repo and apply it.

Once you dig deep enough into many tech buzzwords you'll find that that different people can mean slightly different things with the same words. Some may consider special PR comments to control infrastructure operations as a form of GitOps because what would otherwise be a button in a dashboard now lives alongside the Git history in GitHub.