With the help of woodinsight I found some info in English
Same technical features for the "Zvezda-5" (first pic above) and "Zvezda-6" (second and third pcis), realized respectively in the 1955 and 1957. The engine was a 250 cc, always two stroke and supercharged, with 4-speeds gearbox, indipendent suspensions. The "Zvezda-5" is shorter (3, 20 meters) and lighter (360 kg), with a power of 50 hp, 200 km/h; the "Zvezda-6", instead, had a more powerful engine (54 hp) and, although the higher weight (420 kg), it was capable of 220 km/h. The engineer of these cars was A. Peltsser, who based these models always of the pre-war German DKW engine.
