I have had many Canon EOS cameras. In Paris France my EOS 7D was stolen. I purchased an EOS 90 in Prague to continue taking pictures on my Danube cruise. Surprise when I tried to register it here in the US after returning to my home. Is there any way to get suport from Canon for this camera. Are the cameras that much different? None my past cameras and lens have failed, but geting the camera info from Canon has ben good. I expect the software may also be different? Dissapointed at best.
I have not been able to find a difference in Canon and Canon USA gear. The Canon cameras and lenses are made in same factory using the same parts seem to be identical in finished product. However, the accessories and manual plus the FW (language) may be different.
It has been my experience Canon USA doesn't like to service non-USA cameras. But they do seem to have few issues servicing non-USA lenses no matter where they are bought.
"I purchased an EOS 90 in Prague ..."
I doubt you will be able to register it but a call to Canon with an explanation just might prove fruitful. Canon USA is more forgiving than Nikon. Nikon USA won't touch non-USA gear, period, unless they have changed lately.
The camera will be the same, the difference as Ernie stated is with the accessories and ancillary items.
Canon's service policy on not working on gear in the U.S. that was purchased abroad is part of their method of protecting against gray market products and thus protecting their authorized U.S. dealer network. In warranty would be a definite issue but you may get them to service it when it is out of warranty. If not, there are some excellent repair places which can do repair/service like they do for Canon gear that is too old to be supported by Canon.