If it's a "genuine Nissan" bar the part number will be on a silver sticker inside the centre section of the bar visible from the front of the vehicle, just on the right-hand-side of where the number plate is.
That looks like a genuine bar. They're made by ARB but missing the fog light mounts. The sticker should be on the driver's side of the rail at the top of the horizontal bar that the number plate is attached to.
If it's a Spanish build vs Spanish build then it will very likely fit. Spanish cars can be identified by a VIN that starts with 'VSK' (check your rego papers). Thai builds start with 'MNT'. The bar off a Thai build may not fit the Spaniard and vice versa.