If i switch to Canary will my save data be the same as nightly?

just asking since im not sure

In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.

Yes, both Nightly and Canary share the same user folder by default. You can verify this if you go File -> Open Citra Folder if you end up in the same location.