Yep, that’s pretty much the only difference between the two.
BTW, I did a little bit of editing…
One uses the Renesas internal chipset i believe and the other the Panasonic.
Panasonics - 4164 , 4166 , H20 , H22 , H50 , H55, H58 , H72 , GH22
Renesas - 4163 , 4165 , 4167 , H10 , H12 , H42 , H44 , H62 , H66 , GH20
…that’s a little bit more like it [based on the list of drives Ala42 has in the MCSE thread–they’re grouped based on the chipset, and on the LG FAQ. Also, for all the 416x drives [except 4160], even-numbers at the end signify Panasonic; odd-numbers signify Renesas.]