Android Question Bad upload certificate

When uploading a new version of my APK to the Play console, it complains that I'm using the wrong upload certificate.
I have an export (DER) of the correct upload certificate (the same SHA1 signature), I installed it, but it seems I can't get the APK to be signed with it...
 
The only change in the mean time is that I'm using a different laptop, so I thought about certificates.

I'm also not sure about the keystore file. Does it should be the same from version to version? Does it have any relation to the certificates?
 
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