No. The chipset is different.
but in a review of the 812s it said it shares the same internals at the 811s.
link to review?
811 and 812s are completely different drives.
you can crosfflash 401s->411s->811s
LITE-ON IT CORP. has released the SOHW-812S half-height ATAPI / E-IDE 8x DVD Dual ReWriter. Sharing internal parts and mechanism with the previous LiteOn model (LDW-811S), the drive is capable of writing DVD+R and DVD-R media at 8x, while the rewritable speed is 4x for both DVD+RW and DVD-RW formats.
It has a different OPU (which is the main problem) and a different revision of the analog processor, which can also handle -R at 8x.
worth a try