Not necessarily, although some driver to driver variation is to be expected. Ideally you'd measure the results and if necessary tweak the crossover.With this argument, you also strongly advise against buying speaker kits.
I'd expect commercial manufacturers to do quality control, and where necessary either adjust values or reject out-of-spec examples.According to this, even ready-made loudspeakers would have to exhibit extreme fluctuations in measured values if they were not developed individually, specimen by specimen.
I never said the variations were extreme.these extreme fluctuations in measured values do not occur
We can certainly do that here, but I believe that the majority of kit purchasers tend not to know how to make acoustic quasi-anechoic measurements.... 🤔Ideally you'd measure the results and if necessary tweak the crossover.