Just to share what I have learned recently: RHD and LHD Alpharex are indeed different lights/SKUs - contradicting TSportline's claim that there is no difference. EVoffer are HK based (a RHD market) and explained that they would not be able to pass MOT with the LHD lights. Their order page also lists them separately. RHD Alpharex is listed as available for a pre-2016 refresh but out of stock for post-refresh.
I am still hoping for a side-by-side comparison, but none of the resellers appear interested in supplying this, which is kind of strange. Their installation videos remain MIA.