Both the BA and the Kicker OEM speakers are 2 ohms.
Imaging wise, the difference between the two (as reported by members of LXF, my wife and myself) seems to be this:
BA, overall, has a more muted tonality (some say "muddy").
Kicker, overall, has brighter imaging (some say "tinny").
Kicker is certainly rounded out with a subwoofer of any kind and the matching OEM cabin amp (whether it's the DSS upgrade, or the standard amp).
Mismatched BA speakers with Kicker amp, or the other way around, will yield unsatisfactory imaging, nearly every time.
I did a Kicker speaker upgrade and left the BA amp in the wife's Magnum and she hated it... I installed the OEM Kicker amp from my SRT8 Charger and she LOVES it! Same speakers, matching amp.
I upgraded my OEM Kicker cabin amp to the DSS amp and WOW, what a difference! Now the wife wants the DSS amp
Just my .02, but from experience, it's best to match the amp and the speakers when doing an OEM swap.