This would be the death of the true AUF as it almost impossible to get training on true ultralights or proper tail wheel craft as it is now in the north hope this is just rumours and not fact !
As far as I know there is no difference between the two apart from a paper trail one was registered later so was branded with 55 the other was 25 and home built are 19. And there are a few with VH brandings but the aircraft are to my knowledge the same eg GA 55 as mine is & GR 582 -532 areopowed units & 912 s think there is one flying with an rotex radial engine as well !