The differences between the two are so minimal that, you'd probably only be able to tell the differences by measuring them.
DVC and SVC are only used for different wiring configurations.
2Ohm SVC(single voice coil) will have a final Ohm load of 2 Ohms.
Used if your amp puts out near 400 watts @ 2Ohms.
2Ohm DVC(dual voice coil) can either have a final ohm load of 1Ohm parallel) or 4 Ohms(series).
Used if your amp puts out 400 at 1Ohm... or 4Ohms.