Only in few cases, e.g. the Japanese FCS-3A, two radars are combined into one system. In many cases, two radars with different names are used, e.g. SMART-L and APAR.
I have not checked how the combination of 5P-27 Furke-4 and 5P-20K "Poliment" 4 works on the Russian project 22350 or which radars are used on the Chinese Type 055. But combinations of different radars for AAW is common.