It has been acknowledged previously that the Charlton guide does not exhaustively list all known FPN/BPN combinations for the 1967 notes. If you can have your note authenticated by the Editor, it may be able to be included in the next catalogue.
Squid: Replacement notes that have the same serial numbers of regular notes is very common. Simply being in the same range is just luck.
Logged
BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.