Juan,
i'm not well versed on nissan electrics but i can say that in general when a controller is replaced unless it is required by the mfg to have machine information before ordering it will only come with a default program in it. These general default programs are enough to allow the machine to run in most cases but all of them should be programmed to the machines specific features. Anyone that replaces a controller should at the very least go into the controller and verify all of it's settings. There are voltage settings and possibly some calibrations that need to be made like you suspect, the accelerator may need to be calibrated, and in many cases the hydraulic settings calibrated and then steering.
Like i said, i'm not that familiar with how nissan does their electric machines but i suspect there is a setting that needs to be calibrated or a feature enabled to get it to run correctly.