If it is a "grey" market truck, meaning it was not produced for the US market, things like the wiring (gauge), electrical components (alternators, starters), mufflers are more than likely different to meet the UL standards.

Not certain about Toyota but when I was with Mitsubishi (before MCFA) in Houston and grey market units were all over the place we did not carry service parts for the units and couldn't order them - we were part of Mitsubish Corporation (trading company) that order parts from Mitsubishi Heavy Industry(engineering & production). After MCFA started up that changed some what as Mitsubishi Heavy Industry is the major owner of that company.