I just did a couple of matches in 5* yesterday on WE 2008.
Difficulty was indeed equal than in PES2008.
It's mostly the Super Star level I - personally - find easier.
I still think rythmn in WE 2008 is sligthly slower. Almost nothing but I can feel it.
Regarding crosses, I don't find them less effective. Scored a couple of headers from cross and AI scored a header on a corner kick.
I don't have felt different first touch or shooting compared to PES 2008. I'll experiment more.
Finally it was indeed smoother but I used to play PES in 50Hz. I'll try 60Hz to compare.
[EDIT]
In 60hz, I feel they play equal.
I have done the same game with same difficulty (5-star) and to me, PES 2008 is finally harder.
Look at the stats here :
https://evoweb.uk/threads/pes2008-p...-game-video-thread.77796/page-29#post-4171423
I don't know if the AI plays differently in Cup or Exhibition mode though. It confirmed the previous tests I did months ago.
I still don't feel a difference in terms of shooting or first touch. I'll continue to explore.