Note the claimed detection ranges for a target with a 4 m2 RCS:
92N6A: up to 480 km
92N6E: up to 250 km
Also, note the large claimed difference in max number of simultaneously tracked targets:
92N6A: up to 99
92N6E: up to 40
(the following source, however, claims up to 100 for the 92N6E:
vko.ru/oruzhie/zrs-s-…)