Three OS2U Kingfishers are linked: 5926, 5725 and 5909. These are three separate aircraft.
c/n 5926 is A-752, but I can't find info on the others.
I posted a comment on 5725 noting that it is also profiled as 01368. It seems there is discrepancy among researchers as to which BuNo this one actually is. These two could be linked if the profiles were made compatible.