Well the IAEI does offer certifications similar to ICC.
Now heres what I have found out from my research into the two.
If you take and pass the ICC certifications the IAEI will reciprocate their certifications with the ICC's. The ICC WILL NOT reciprocate the IAEI's certifications.
So if you take the ICC certifications you can prove your passing to the IAEI and receive theirs via reciprocating and have both !
In my part of the world - most jurisdictions or companies that want certifications, want the ICC certs