If I have a iPhone and iPad will the passwords and Apple ID be the same?

Passcode or password isn't working?

See the Apple Support article(s) below.

Passcode - If you forgot the passcode for your iPad or your device is disabled.     

Are you using the same Apple ID on both devices?

For the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get an email option if necessary.

Apple ID - Manage            

Apple ID – Forgot Password           

One AppleID can only have one password.

However, each device has its own passcode.