As far as I know, Panasonic builds everything native.
Some years ago they had a phone system called DBS which looked to me remarkably similar to NTK (Nitsuko) in terms of how the PBX cabinet and cards were constructed. I asked if this was a re-badge and they said no, they build everything native, it was just a different factory than their KXT line of PBXs (the ones I install & program). The DBS system has since been discontinued, and KXTD has morphed into KXTDA (even 15-year-old KXTD phone sets are forward-compatible to the KXTDA PBX; we're taking advantage of this factor in an installation next week...).
So if that washer is similar to a WP, my guess is that they evolved independently and the "innards" would clearly demonstrate that. Panasonic doesn't "copycat" either, since that would be playing fast-and-loose with other companies' patents, and Panasonic tends to follow oldschool conservative business practices in general which includes avoiding scandals.
Someone got that set via buy it now. Was that someone here? (And if so, can you post pictures?

The seller said the washer wouldn't handle sheets; I suspect it was because they were trying to overload it with too many at once.
Meanwhile, Panasonic and other Japanese companies still make wall-mounted dryers. Very clever idea especially for a market such as Japan where apartments are small and wall mounting solves a space issue. For a while, there was in the USA a wall mounted Maytag or Hoover (I don't recall which) dryer that went along with a corresponding compact TT washer.
And in the last year or so Panasonic has brought out an inclined-axis FL product line including a washer, dryer, and washer/dryer; they have a couple of really clever engineering design points I can't recall off the top of my head but were related to energy efficiency. (I should go look up the press release, which I saved...) This stuff is available in Japan but not in the USA (yet!).