I wouldn't be so quick to assume that a single engagement radar could guide multiple types of SAM systems.
Also, the SJ-231 does appear to be the same array as previsouly identified as HT-233...could the HT-233 have been misidentified? It is likely that there is an early warning radar for the system, and that could be the HT-233 (a 64N6 or 36D6 analog). What do SJ and HT stand for?
A rare high-resolution photo of LD-2000.
(2048 x 1365)