I've managed to use both OTG.
I'm looking at them now (both good and poor variants), and both have the designation (not when moused over in live mode, but when picked up in B/B or moused over in the catalogue).
As well, I'm able to use the OTG options for both ("Take Quick and Tepid Bath" (tub) and "Water-Saving Flush"/"Turn Off Utility Usage" (toilet)).
With no water, any toilet seems to work just fine for usage whilst OTG, but cannot be flushed. OTG toilets can be flushed using the "Water-saving flush" option. Tubs cannot be used without water, but OTG tubs can be used with the "Take quick and tepid bath" option. The crafted ones work just so.
Hope that information helps.
