I know I’m probably going to look like the uber geek for this one,
but I actually called the Plextor company about this. :o 
I was bounced from one department to another, until finally someone was able to answer my question.
The only thing that actually differs from the UK/Japan version and the US version, is the tray mask.
_

The bezel itself is exactly the same.
_

¯
You can blame the OEM/System Builders in the US for this. :a
According to the Plextor representative,
the majority of US OEM/System Builders prefer the drive not to bear the Plextor logo or model number.
Based on this, a corporate decision was made not to include the brand or model number
on the tray masks that ship with the US versions of the drive.
Business, I guess…
He added that only the European and Japanese versions have the logo/model number on the tray mask.
Of course, I then asked him if it was possible to have the tray mask specially ordered from Europe or Japan.
To my surprise, he informed me that I wasn’t the first to call and request this. 
Furthermore, as a result of the various requests for these tray masks,
they previously attempted to contact the European and Japanese divisions in regards to this.
Not only did they both refuse to ship the tray masks, but the drives altogether.
He went on to explain that the divisions in Europe and Japan are completely separate from the US division.
And that the reason for their refusal was due to some shipping conflicts.
Politics, I guess…
Anyhow, he suggested that I check on eBay or for online stores in the UK that ship to the US.
I then asked him how that would be possible given the said conflict.
He replied, “They shouldn’t do it, but some still do.”
Moola, I guess… 