IMHO, yes. I use a pressure tester and re-shim them as needed to get the pressures to match.
HOWEVER, what I find is that old, worn injector nozzles(the bit that wears) will wear at different rates and within a few thousand miles they will 'drift'.
If you can, the best thing to do(aside from just buying a complete set of injectors new) is to buy a new set of nozzles and build yourself the set. OEM nozzles are expensive and hard to find, but China has some copied nozzles around. I bought a set straight from China(for around $50), and I see one company on Ebay selling a set for under $100.
I've worked with chinese nozzles before and they work just fine - a machined chunk of steel is a machined chunk of steel. If it works initially(when building), it'll keep working.