copy field to new document
Copy & Paste of a field - Within a document works as expected - the formatting, naming of the field is consistent. However if you copy paste into a different document, the field properties seem to reset (if this was correct, why would you copy/paste & not just insert a new field) - expected behaviour would be to keep same size/format/code/name & position(if possible, if not centred on screen).
Only noted work-around, is to copy existing page into new document, copy/paste field from one page to another & then deleted the inserted page. - Comment elsewhere requests a MS Office style 'format painter' - this too would be a good alternative (or like the eyedropper tool in Illustrator)