Thank you Jimano. Based on your explanation, more research is required before coming to a conclusion....

Situated in an obscure town in Malaysia, perhaps, this is the only temple in the Asia-Pacific region that follows the pancaratra agama tradition of Sri Vaisnavism.
For instance the Puchong Perumal temple has both chakraththaalvar and aandaal sannidhis. The priests are from Srirangam (One of them conducted my graha pravEsam rites and makes real fantastic puliyOdorai .)

It is also quite likely that the differences you have mentioned have become murky, once outside the traditional home of TN.