I was checking out a distributer website and notice that they had broadheads listed as a "Cajun Aztec" and "Cajun Concord".  Are these the same thing as Tuskers?  The design and grains seem to be spot on.

I believe they are one and the same.

Cajun archery was (and still may be) the North American importer for Tusker broadheads which are made in Australia (excellent broadheads by the way).

GDay Bear Heart,
Yes it is like Rik said.
Cajun was and still is a distributor for  Tusker heads, but untill recently I was unaware they were marketing them as Cajun Broad Heads.
So I have put a stop to that and opened up to all dealers and Distributors.
As you may have heard KME will be selling single bevel Tuskers sharp soon.

The Tusker Concorde 190 is a great head!  I've been able to test some for a while now.  For those of you who've been asking for a left bevel alternative to the Grizzly 190 that won't break the bank, the Tusker is the ticket.  

It wasn't Cajun doing it.  Another distributer had them in their catalog.  I'll let him know.

What is the best insert to use for the concord

I'd suggest an 11/32" for those.