@BlueSpaceBike
You can use the original MM seed or create a new MM wallet. But never import a seed from a hardware wallet.
The address where your ledger connects to MM’s ledger-mm wallet is generated by the ledger seed. You take your ledger, go to anyone’s computer, connect their mm, the eth address of the standard wallet will always be that one. As long as the passphrase for the hidden wallet is determined, the address will not change. Nothing to do with MM. Using MM to connect ledger or trezor, MM is not used as a wallet, but only acts as a bridge.
You can try it yourself, install MM on Brave, Google, Firefox 3 browsers, make sure the seeds of 3 MM are different. Connect the ledger separately, do not enter the passphrase, or enter the same. See if you can find the same wallet.
It is strongly recommended that you change the seeds of ledger as soon as possible. First send the assets to other wallets for temporary storage, and then use ledger to generate new seeds. Take good notes. Old seeds have been exposed online for too long and should not continue to be used in cold wallets. Of course, you don’t have a cold wallet anymore either. Your current ledger is already a hot wallet.