Hello, so if I get it right you want to know if the spokes you have and which are too long may fit? From my experience even 2 mm too long does not work.
2 mm or maybe even 3 mm too less would eventually work better, depending on the nipples.
I am surprised by 196 mm. Are you sure? I most cases for cross lacing you need about 184 mm or 187 mm.
Do you have the ERD of the rim and the measurements of the hub? I would like to try my calculator just out of interest...