Couldn't find a good English source, but this German Golem article explains that WD blue is based on planar 15nm TLC cells from Flash Forward (joint venture: Toshiba & WD) and uses a Marvell controller. This combination isn't new, just take a look at the SanDisk X400.
It looks like the WD Green SSD uses the same cells, but another controller from Silicon Motion which does not even have a cache, making it a poor choice in most cases.
So yes, it's just rebranded with a slightly modified firmware.
I think this pretty much answers my question. Thanks!
Just to clarify: PowerShell is not required here because wusa(.exe) is a regular executable file, not a cmdlet. Any other way that let you execute a program with elevated rights will do (e.g. cmd.exe, shortcuts, ...)