Are the Nimiq Account Recovery Words compatible with the Ledger Nano S Recovery Words?

No, they are not compatible by design. The idea of a hardware wallet is that it prevents access to the private key from the computer, especially from infected computers. Thus, neither the Ledger Nano S Recovery Words should be imported to your computer, nor should the the Recovery Words generated on your computer be imported into the Ledger. If you loose your Ledger Nano S, the recommended way to recover your funds from your Ledger Recovery Words is to import the Ledger Recovery Words into another Ledger Nano S device.