Mannargudi itself was established during rajendra-I period. Rajendra chozha vinnagaram. Kulasekara perumal reached lord's feet here and there is a special shrine for him in the temple premises I think.
During late Rajendra-I period, the king of chera country (who comes after baskara ravi) Rajasimha gave nivandamas. I always wondered why chera king was interested in this temple and only later learnt the Kulasekhara association
Thus the temple is older than Kulothunga.
But not the bronze. I may be wrong - but most likely the present deity is not of chola origin.
Vaduvur bronze - Dr.Kudavoil opined that it is 'Raghunatha nayaka period'.
You can compare one to one and wonder the similarities in facial expressions.
SPS - I am awe stuck with Konerirajapuram information. Thanks a lot