gr:
I don't know about the 9mm but the .40/.357 mags for my P226 will not fit in my P229.
Someone else out there may know...if you don't get an answer, just try a couple of rounds. If it works, you're probably OK. Notice you live in the Middle East...Germany may be your best bet to obtain Hi-caps for your P229. Franconia used to be the biggest gun sports outfit there...might try them and see.
Mike