Welcome to caraudio.com!
To answer your question, no. But two different subs isn't going to sound as good as two of the same sub, although there are of course exceptions.
Here's a little off-topic advice...Sell your equipment and start over. I'm just suggesting that you can do a lot better for the money //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Here's a couple options for some starter subs -
Acoustic Auto Tunes
http://www.techronics.com/caraudio_2167_Alpine-SWR-1242D-12-inch-Dual-4-ohm-Type-R-1500-Watts-Car-Subwoofer-SWR1242D-.html?aff=72182
SSA Store - Sundown Audio SA-8 Subwoofer
Sub Woofers - Skar Audio - SSA STORE
As far as amps go, take a look into MB Quart Discus, Audiopipe, Audioque, Cadence, and there's many more to list that I can't think of off the top of my head.
I should also let you know that when it comes to car audio, what matters MOST is the box enclosure(s) and the wiring/install. I would rather have a P1 in a proper enclosure than a P3 in a poorly built pre-fab box. And the quality of your wiring job, as well as the amount of current that you constantly supply your amps with is extremely important as far as the quality of sound (no cutting-out of notes), loudness, and reliability is concerned.
Good luck!