The left and right speakers are electrically identical, so no damage. Even if you mixed the speaker type you'd be OK, they are close enough. :)
The worst that can happen is a left to right inversion of instruments in the sound field.
Now, if you invert the Red/Black (i.e. plus and minus) connections on only one speaker you'll suffer a variety of acoustical effects, but again, no damage.
The worst that can happen is a left to right inversion of instruments in the sound field.
Now, if you invert the Red/Black (i.e. plus and minus) connections on only one speaker you'll suffer a variety of acoustical effects, but again, no damage.