Hello, this is Emily.
Yes, you should be able to keep the same password. Are you prompted to change your password every how often? Can you confirm if it is password, or PIN, because these are two different things.
If it is password, go to https://account.live.com Sign into your account, go to Security > change password, and on that screen, you have the checkbox of asking for change every 72 days. Make sure that box is unchecked.
If it is PIN, can you go to Windows Settings > Accounts > Acccess Work or School, if there's an organizational email listed there, please select and disconnect.