Even with what appears to be very different TS specs it is possible these two drivers would sound quite similar in the same box. And again IMO even 4.6mm xmax is a bit low for a PA sub(just 40hz response here not 15hz home theater rumble) that is supposed to handle 1000w, so if you're looking at buying other drivers I'd suggest the Lowrider 18. You would have to do some testing to see what the final system response would be with that driver/cabinet combo but the Lowrider also works well in 5-9cu/ft enclosures.