I didn't tried that scenario. As far I know the tokens are on your device, not on their server.
So maybe you can "import" your mint seed into another app but not sure about the tokens you already had.
In nostr:npub1kvaln6tm0re4d99q9e4ma788wpvnw0jzkz595cljtfgwhldd75xsj9tkzv you can use multiple mints.