You got the orientation right.
I just checked the MegIchip that they sent me, and it has a 318069-11 on it. Maybe I chould try that chip in the MegAchip?
I think your problem is the Agnus revision in the MegaChip, it should work fine with the the "-11" part (it's what's in mine). Is your other one a DCE MegiChip? Most (all?) of those had the Agnus soldered on. :/
*edit* they must have sent you
one of these? In which case you're golden, swap the Agnus and I bet it works.