Currently, Ghost has no way to edit or overwrite snippets. Typing in the same name for a new snippet also does not apply this behavior.
While I see that this feature is planned, it’d be great if that’ll include the ability to rearrange the order of snippets.
What I do presently is:
- Add the snippet to the page
- Edit the contents of the snippet
- Delete the snippet from the cards panel
- Add the snippet again with the same name using the edited version on the page
Granted it’s a bit of a irregular process, but it’s pretty quick 
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You’ve probably figured this out by yourself by now, but since this thread is still open, I thought I’d add that there’s a simpler way to do this.
- Add existing snippet to page/post
- Edit snippet
- In the snippets menu, type the name of the snippet and it will give you the option to replace the current one.
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