@dixi188 - provided they didn't get them mixed up on the production line.
I seem to recall at least one Hawk on the line at Kingston/Dunsold had more than one serial number ...
in fact, I just dug out a yellowing sheet of paper (a copy of an old magazine article in fact) which says front fuselage #264 was mated to centre/rear 241, as 241's "proper" front had been robbed for another aircraft.
But I'll be shocked if this was a question about HS works order numbers!