Windows 7: LG UH10LS20 K vs CH10LS20

I just received a Blu Ray combo drive (CH10LS20), but the one that I ordered was a UH10LS20 K. I have been trying to compare the specs, to decide whether to complain about this or not, but they seem to have the same specs, except that one PDF spec sheet that I found, gives Blu Ray write speeds for the UH. At the price that I paid, I know that it is too cheap for BD burning, so I don't know that the specs are correct. My head is in a Google spin, so I'm hoping that someone knows the difference?