At current moment Confluence does not have that feature, as mentioned in this post we raised a feature request for that:
Make sure to vote for the feature :).
As a work around you could edit the template in one tab, copy the content with CTRL+C short cut and paste into the create template editor of the other space you want. Don't forget to re add any local variables since those might get lost using this method.
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
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