Not sure about the other Yugoslav Government Boeing 727 but here is a brief detail concerning YU-AKD.
Boeinging 727-2L8 YU-AKD was delivered to the Yugoslav Government in 1975 with a dual civil and governmental registration, the governmental registration being 14302.
The aircraft went to Aviogenex in 1983 as YU-AKD.
The aircraft was leased to the Danish company Sterling Airlines between 1986 and 1987 and re-registered as OY-SBJ. The aircraft returned to Aviogenex in April 1987 and assumed the registration of YU-AKD.
The aircraft seemed to have quite a varied career as it was leased to some other operator's before being eventually withdrawn from service. I also believe that it was the last passenger Boeing 727 operating in Europe. It was scrapped at Belgrade in 2006.
Boeing 727-2L8 YU-AKD at London Heathrow Airport in July 1979.
Boeing 727 2L8 YU-AKD at Luton Airport 15 June 1981
Boeing 727-2L8 YU-AKD on lease to Sterling Airlines as OY-SBJ, wearing the Aviogenex cheatline with Sterling Airlines titles and tail colour's. Seen at Salzburg Airport, Austria in January 1987.
Boeing 727-2L8 YU-AKD at London Gatwick Airport on the 16 June 1989.
Boeing 727-2L8 YU-AKD at Manchester Airport on 05 October 1990. Not sure what airline it had previously been operating for when this photo was taken, it could well have been JAT but I stand to be corrected.