Fuel Injector questions

[DGraber460 at aol.com]

I have 3 different sets of injectors with 3 different part numbers.
The family album shows #049-133-551 A as the part number for all years  of 
URQ in US (83-85). It shows the same number for '88 5KTQ, but superceded by  
026-133-551.
 
One of my sets is number 049-133-551 A.
The other sets are 437-502-023, and 437-502-015
All have "014" in a circle stamped on them as well. Is that a flow rate  
reference?
Some have numbers stamped on the hex portion as well and some don't.
 
Any injector Gurus out there that can shed dome light on this?
On testing, some have better spray patterns than others, but I don't want  to 
mix and match unless they are the same flow rates.
TIA 
 
Dennis 
Denver