LG WH10LS30 or BH10LS30...whats the difference?

It seems these 2 drives have the same specs so whats the difference between them?
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http://www.cdrlabs.com/forums/
http://www.cdrlabs.com/forums/wh10ls30-bh10ls30-whats-the-difference-t25389.html
jellyhead wrote:It looks like LG has a couple of new drives BH12LS30 and BH12LS35. There doesn't seem to be any difference between these
jalyst wrote:How do they differ from the xH10LS30 series?
Ian wrote:They write to BD media at 12x.