Difference between the XPUB of a single vs multisig wallet?

When constructing a multisig wallet, you need to export the XPUB of each wallet. With seedsigner, first you create 3 single sig wallets, then export the XPUB for each of them. During the export it asks whether it’s single or multisig and you have to go with multisig. What is the technical difference between the two? via /r/Bitcoin https://bit.ly/3QkFZ65