Yes they are lost because they never released in home video or tv
But I believe that CNBCE dub has the same dub with SE dub but I’m not sure about it.
TRT only aired Star Wars in 1986 1988 1989
The one that I have is the only surviving copy of 1986 broadcast
The TV premieres of ESB and ROTJ was in 1993(SHOW TV)
Russian? I only have 1990 Gorky Soviet Dub from a 35mm telecine