I have several sites that share a common database. Each of those sites has a contact form that saves the data in a MySQL db. The forms collect the same type of information but some fields may be displayed on one form and not on another. I'd like for all the forms to be able to write the information to the same table.

In the instructions, it says that WFB creates the MySQL table. Is it possible for more than one form to use the same table if the form fields are identical?

That is not possible. Each form must post to a unique table in a database.