sorry, tried to edit my last post in time, but got tied up. Here's a crappy post where stuff may be out of order..haha
The short answer is, yes, the lower front door speaker is a bass driver. The below explanation is why the rear door speakers are probably more full range. (I'll qualify all this with the fact that I have an LX, and i know this is true with the LX. While the systems are different, this is all really just general modern OEM car stereo stuff. I would have made the same suggestions if i didn't know what type of vehicle you were talking about)
I found a diagram of the 200. It looks like the high freq speakers are in the dash and A pillar on the LC for the front. Are those functioning, if they are, then your system is probably working as normal (but maybe out of balance). If they are gone as well, that's where you need to look to return to full spectrum sound in your "Front stage". Looks like the rear door speakers have a tweeter as well. It depends on how that was wired in, but it's possible that a full spectrum signal is sent to the rear door and split between the tweeter and the main driver with another HPF on the tweeter, which is why they have full range output. On the rear door, it's also possible you are missing the spectrum normally driven by the tweeter and just can't tell....as we age we can't really hear those frequencies well anyways.
The front stage is almost certainly going to have some DSP/Crossovers dividing freq spectrum between different speakers, especially since there is a mid range driver. My comment about balance above refers to the fact that you probably replaced a 2ohm speaker with a 4 ohm speaker, and if all other things were equal, that would mean you are not using as much power to drive the speaker. It's also possible that the aftermarket speaker is more efficient to offset some of those losses. If you think they are too quiet, you could probably just bump the bass knob a little and reasonably approximate the original power level.