Electrum uses a different code to derive BIP39 seed.
Why? One would think you could look at the phrase used to create the wallet. Not exactly user friendly.
If it's just 12 words, do your best to remember it, at least during your travels.
I look at the words maybe once every three years or so. I hardly used the full node QT software, until Taproot. Now, my computer is too old to run it (which is odd because I thought BTC was "soft fork" backwards compatible). So, hopefully the wallet.dat file will still work when I get a new PC to run the node but that's a different topic.