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Is it a California emissions vehicle? If you put a 49 state cat in a Cali. emissions car is will set low cat efficiency codes after the monitors reset. PCM is programed differently for CA specs. .
My brother had this scenario in a Impala. Cali. cat is way more expensive than the 49 state cat and the shop that did it cheaped out. Not all cats are the same.
Here in NJ new cars are sold with Cali. emissions, same in NY.
 

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It may be OK, only way to tell is putting in new sensors and see what turns up.
That's why sensor should be changed when plugs get changed.
 
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