I think they came in later 4.7 motors. Sorry.
Looks like there is no way around pulling it, getting the caps off, and seeing what size the journals are , and what size the big end of the rods are. Could plastiguage them one at a time as you remove them , to see if you have a few caps mixed, or there is something wrong with the whole lot . Bummer, there goes another weekend or two .
'