Hi,
Thanks for all of you for quick reply, I'm glad to carry on this conversation.
Ok, let's clarify some points:

Mercedes Benz like Chrisler Crossfire use two modules for the initial start:
EZS module (module behind where you insert the key) and Engine ECU (called ME2.8-SFI).
These two modules communicate each other when you put ignition on and start the car using CAN protocol for communication (Controlled Area Network). Within this communication, each module verify data coded and stored with the other.

So on EZS module, it's stored keys codes, VIN etc ...
On ECU there is two active components for this: Eprom and Flash:
On the Flash whitch is an AMD 29F400BB 44 pin, is stored engine management program, cartography, ignition etc ... and no VIN number;
On the Eprom There is stored Immo Data which can be programmed once when the ECU is "Virgin" as new one. So what we have to do, is to reset the donor ECU to make IMMO OFF, so we can reprogram it using DAS STAR Diag.

But Lantana is Lucky, Both ECU you have are Bosch ME2.8, if you desolder the Flash from Donor ECU and solder on the initial crossfire ECU, IMMO data will be exactly the same (not changed), and Engine Management will work fine because the Flash on Donor ECU is programmed to the V8 engine you install and that flash is on the Initial ECU.

Thats what I'm going to do: replace flash.
My origin engine and gear box are down the floor from yesterday, today I'm going to install wiring harness on the 55 AMG engine, speedshift gearbox, hydrolic pump and belt. Then install the V8 55 engine in the car and wiring.

By tomorrow or monday I will arrange electronics and try to START ..

Hope you success and wating for reply.
Karim H.