AD7821 with 12 Bit Resolution

We are using AD7821 ADC (8 bit) in one biomedical instrument. But, now to improve accuracy, we need 12 Bit ADC. Since we have current stock of PCB's where AD7821 is used, is there any ADC IC which is pin to pin compatible to AD7821 with 12 Bit resolution.

Or can you suggest us any solution?

Thank you in advance.

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