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The serial interaction of the impedance of two complex networks such as speaker systems is bad enough when they have the same curve. Two dissimilar speakers will have very unpredictable (well, very hard to compute) results.

When a cross-over network is being designed for a speaker, the sensitivity of each driver is taken into account, to achieve a linear response when everything is combined. It's fine to wire two fixed resisters in series, you just add up their resistance and the sum is also fixed. But that's not how a loud speaker system works. You'll end up with a non-linear response with areas of higher impedance stacking up higher than the lows.

It's then obvious how much worse it would be with two different speakers interacting with each other.