I have a few plants with different names that look the same. In my garden rectifolia Chionea looks just like rectifolia Nikai and Rohdeifolia. None of these names are registered. But in the MyHosta database there is a reference to a registered hosta called Ginbuchi Tachi where is states "Japanese name for H. rectifolia 'Chionea'?". In Chris's comment section of the hosta Silver Star he mentions:
Comments: This sport of Hosta rectifolia is known as Hosta 'Ginbuchi Tachi' in Japan but has been renamed Hosta 'Silver Star' in the US to distinguish it from the registered plant of Hosta 'Ginbuchi Tachi' which differs significantly from the hosta we are selling.
H. rohdeifolia was always one of those suspicious species. I expect these will be different in flower. Rohdeifolia ("the hosta with leaves like a rohdea") has absurdly tall flower scapes for the plant size. For years it may have been sold as H. helonioides 'albopicta', which may or may not be the same as the ones you list... They have different names in Japanese, too.