Some of the things to be considered are power handling of the components, useable frequency range of the drivers, directivity at crossover, signal synchronization, slope of the filter, topology of the filter, CD horn HF correction and did I mention price both manufacturing cost and selling. I assure you there are no two loudspeakers designs truly alike. You have no control over the time issues or the directivity properties of the speaker. An EQ can only change the frequency vs. magnitude response of the speaker. Even a really good totally parametric EQ has a rough time correcting the frequency response of the speaker.
Frequency response is only about one half of the picture.
There is the time response, polar response and distortion. Again, the issues of what can be corrected with an EQ become the limitation of what can be done to tame a loudspeaker. Third, even if careful and appropriate EQ was applied to two different loudspeakers the possibility of matching them within a dB of each other is slim. Again I hope that I have answered your questions and look forward to hearing from you in the future. I'll be wrong again.