Since mint was re vamping 1965 thru 1967. SMS were the only type of coin striking being minted SMS they were working dies to.
So it is probably not possible to tell the last SMS coins from the first biz coins for any given die?
If there was a unique die marker on a SMS coin that you could match up with a business strike coin it would be possible. Good luck in your search. Sounds like another tail chasing endeavour.