The engraving is on both sides and it’s the same engraving on each side, BUT not all yo-yos have the same engraving. They either have an engraving of the front end, middle, or back end of the car.
Edit - Here’s an example of the different engravings:
Yeah, I saw that photo and thought that maybe the section of car you got was based on which color you chose. But you’re saying it is completely random? That’s fine. My request to swap halves with someone still stands.