Incorrect. The only difference between the 324-98 and the 424-98 is that the 424 has Lightscribe. That's the only difference. Both are rebadged Sony/Optiarc drives.
The Lite-On drives with the -98 designation are rebadged Sony/Optiarc drives (with NEC chipsets), and as of right now, they can NOT do bitsetting. At some point in the future, they will probably be able to, as the drives they are based on can using Liggy's bitsetting firmware, but when that will happen is anybody's guess. Lite-On has mostly switched to using rebadged Sony/Optiarc or NEC-chipset drives for their 24x DVD burners, and the older models based on the MediaTek chipset have been discontinued.
If you want a genuine Lite-On that can do bitsetting, then try to find an iHAS324-08 or iHAS324-09. What country are you in? There are many still available, but not at the discount prices you would find when they were in regular production. The average cost is about $40 with shipping. Here is a reliable vendor:
You can also try looking for model DH-24AAS, which should also be a genuine Lite-On.