Eric hasn't heard the BA200 yet but from what ClieOS has said they have basically the same sound signature, like the IE800 is a dynamic driver version of the BA200. I haven't heard the IE800 but I tend to think they would sound a lot alike because TDK is good at making everything have that warm smooth house sound.
I don't know if he ever said they have the same sound signature; what he has said is that they are on par on overall sound quality and "both warm sounding".
Here's a quote from his reviews thread:
The only other comparison I can find in English is someone from Stereo Electronics (a Singapore store) saying this here:
Edited by PeterDLai - 11/30/12 at 10:34pm