I think the basic difference between analog and digital speakers is the technology employed,
From the TI site:
The first is the digital audio pulse-width-modulation (PWM) processor, which employs advanced digital signal processing and fourth order noise-shaping to convert the digital data from the source into the PWM format. The second stage is the digital amplifier power stage, which applies the digital PWM signal directly to the speakers, maintaining a complete digital path from the source to ear.
I don't think analog speakers contain the PWN pulse width modulation processor.. Also I think the amplifiers are different as well. As for the tweaters, woofers, coils etc... I am not sure if they are actually the same, but I am still looking.
I would think that the speaker hardware would remain the same, other than the input and output and how it is transcribed over the different hardware.
Not too sure.