Hi,
There are variations in Wii Remote circuit boards, but that may be due to different factories or cost cutting with subsequent revisions.
However, the genuine camera in the Wii Remote comes from Pixart and it comes with 8 pins and a metal square casing.
Any other camera is not genuine and has been designed that way to either circumvent patent laws or overcome manufacturing limitations or trade secrets.
I would change suppliers to get the real deal.
Other information I have found useful is
1. Chris the Carpenter
http://letsmakerobots.com/node/25513http://letsmakerobots.com/node/287892. Stephen Hobley
http://www.stephenhobley.com/blog/2009/02/22/pixart-sensor-and-arduino/http://www.stephenhobley.com/blog/2009/03/01/pixartwiimote-sensor-library-for-arduino/http://www.stephenhobley.com/blog/2011/03/29/strange-wiimote-camera/3. and others on the net.
Thanks