The VK-100 model with a higher air consumption, pressure ratio and efficiency was developed as a turbine starter for high altitude aerodromes where it is recommended as a replacement for the standard GTDE-117.
The new VK-150 APU was designed for engines that require a more robust starter and power generator. It can be used as a starter for RD-33, AL-31 engines and their versions like the VK-150 model.