Article Can I update an ADV7510 design with ADV7511?

Yes, with some caveats.  The ARC function pins are the risks:

Pin ADV7510 ADV7511
46 GND SPDIF_OUT
51 GND HEAC-
52 NC HEAC+

You could simply drop in the ADV7511, but remember that ARC would be unusable and you would have to make sure it was disabled (Register 0xDF bit 0 should be a 1) else you'd be shorting an output directly to ground.

The attached document describes all other minor changes from ADV7510 to ADV7511.

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