They only used some cummins in 2007, some 2007 had the iveco. 960 all had the iveco. If your needs are between a 940 and 960, a cummins might do, if you have had the iveco you will not be happy. I wasn't.
on the Cummins, the engine serial number is an eight digit number, beginning with "4" and contains no letters or spaces. This number should be on a metal tag riveted onto the cylinder block, or embossed on the block, typically near to the water pump housing. Anything other than the above, is not a Cummins.
The Iveco in the 9060 seems to hold on better under load than the cummins does. If you try to push the engine past 100% load the cummins will lose rpms sooner than the Iveco. The Iveco is better on fuel too in my opinion.