This forum is for the Adobe FormsCentral (formscentral.adobe.com) which is a service that allows you to create, collect and analyze data using an online web form. You should ask PDF related form questions in the Acrobat forums: http://forums.adobe.com/community/acrobat/forms
I'll move your post to that forum so you don't need to retype it. They can help you out...
If you name the fields the same, they will all have the same value. Note that this won't work for digital signature fields, however, since you can't have multiple signature fields with the same name. Since a signature applies to the entire document, there's really no need for multiple identical signatures.