Making speakers sound tonally similar with an equalizer

While I say EQ's are a bad way to try to make one speaker sound like another, I've also seen Stereophile adopt B&W speakers as their reference, and Golden Ear matched it and got rave reviews... so... maybe there's something to it.

Dynamic range matters.  A lot of highly regarded speakers have a lot of compression and distortion which is impossible to replicate with simple EQ.

Then the issue is that there is no single universally accepted standard for measuring the frequency response of a speaker in a room.  Consider a planar or horn speaker, vs. traditional dynamic. The integration of the speaker's signal with the room over time varies a great deal here.