Yes. LiteOn has used the Plextor brand for some years now, and has produced a drive or two for Vinpower under that brand name.
Vinpower also got special Optiarc models, and continued to get them for a while after Optiarc ceased operations & LiteOn absorbed the remnants. (I assume that LiteOn had enough parts in stock to continue fulfilling orders & to make zombie drives that were similar to Optiarc designs but came to exist after Optiarc ceased production).
But these special Vinpower variants are generally labeled as such, due to whatever tweaks Vinpower wanted, & are treated separately from other drives. Purchasing them & getting support is a bit different from non-Vinpower models.
For example, the PX-891SAF is separate from the 891SAF-Plus; it is the latter that is considered a "new" drive. The regular 891SAF (and its original model, the iHAS124 F) had been out for a while prior to this announcement.
The regularly 891SAF probably has no noteworthy tweaks from older builds of the same model.