I'm not surprised that Honda UK can't tell you about the specifics of a component of a car they don't make.
The US market cars aren't/weren't made at the Swindon plant, where European and some other market cars (Africa) are.
However, it's highly unlikely that the basic design of the seat units are going to be significantly different other than the LHD/RHD bit, ie the height adjustment being on the 'wrong' seat.
So, I'm with you in thinking that the seat covers will fit.