The ADOX site does say the new ADOX PAN 400 Film will differ from the old AGFA 400 in the following ways.

ADOX improved the film in the following ways:

•The graation was straightened which leads to an improoved copy range.
•The old AgBrJ-Emulsions were replaced by more modern ones which have sensitomterically- and technological advantages. This leads especially to finer grain.
•The new emulsions bring AP 400 to a true 400 ASA speed.
•The film has been donated a modern AHU layer which increases sharpness and eliminates halation.