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In the past Nikon has changed the model numbers of cameras depending upon where they were to be sold. For example, the F100 and N100 were the same camera, but one was for the US market, and the other was for the European market. Why the two numbers if they're the same camera? Well, they were not. Each country has different manufacturing standardizations. What England may find perfectly fine and safe, may not be considered so in the United States and vise versa.
If you go to Nikon's US and UK websites, you'll see that the D7500 is listed as the D7500 in both sites. However, this does not mean that they are internally exactly the same, nor does it mean that they both had the same level of quality control either. Nikon, just like any other manufacturer, uses specific model numbers for specific markets. This obviously allows them to know exactly which market the body was intended for, thereby allowing them to know if it was purchased as a gray market camera or not.
I knew a guy who wanted an F300, but to save $100, he got a gray market N300. It broke within the one-year warranty period, so he mailed it to Nikon USA. Three weeks later he received the camera with a love letter from Nikon saying that they don't have any parts for the "N" 300, and that he would have to mail to Europe for repairs. So not only did he have to pay for the repairs because Nikon would not honor the warranty, he had to pay a few hundred dollars for shipping and insurance to/from the repair shop.
I heard a rumor decades ago that Nikon has one level of quality control for their top markets like the US and UK, and a lower standard for other markets like South Africa or South America. Never saw any proof of this, so take it with a huge grain of salt. If this was true, you'd thing that Nikon wouldn't have to recall the D750 three times for manufacturer design defects. Because Nikon has had so many recalls on expensive high-end DSLRs such as the D750 and the D800 (which was so bad that they had to come out with the D810), hold off buying any new Nikon DSLR until it has been on the market for a while.
keerok
Nikon releases all its dSLR models worldwide.