As long as the extender is sitting at the same distance, optically speaking, it is calibrated to work at from the Angenieux than there should be no issue. Sometimes they will not fit due to different inside or outside dimensions. More than likely the mechanical fitment issues will prevent the multiple adapters from working.
It is a tough call without having the parts in front of you.
Make sure they have a good return policy if things don't line up properly.
Matt