Ecu...?

I've just swapped my ecu over for a mines one, when I got my old one out it has a 'Kakimoto Racing' badge on it, also it has a nissan badge on it saying "genuine nissan remanufactured ecu" The part number is also one letter different from the mines one, which I guess is an original nissan ecu. Anybody ever come across this...?
 
Open it up and see whats inside. These cars always have little hidden extras - i recently went to swap my ECU for a mines one and found my one had a daughterboard inside.
 
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