Hi Daisu,
The ADV7625 and ADV7626 are very similar from a register map perspective.
The I2C addresses, functions and most of the values are the same. Certain register values e.g. any controls for port C, port D and port E will not be valid in ADV7626. We will be uploading ADV7626 documentation in the coming weeks - it is currently in development. Until then, please continue to use the ADV7626 datasheet and the ADV7625 extended documentation (hardware manual, software manual etc)
Thanks,
Joe