Cameras have a setting in their menu for NTSC and PAL regarding TV output from camera, but essentially a file is a file- Jpeg or raw. The only thing you have to concern yourself with is making sure you have the correct power adaptors for your battery charger- 110V for US and check to see is Singapore is either the same or if its 220V and get the appropriate converter at Radio Shack.

You may also have to check that the warranty is valid in the U.S., and also taxes when (if) it's declared at Customs.

There may be other items that can be different. I don't know if they are or not. But on some video games (cartridge based) the games sold in the Japan did not fit into the machines sold in the US. It was just a square cut there vs angled here. If you broke the plastic off of it where it plugged into the machine (which negated the protective properties of it) the circuit board of course slid right in and the game played.

Check to see if there might be anything like that. I could see a difference in the location or function of a pin on the hotshoe, fitted cases, or battery or shape of it, and other items that might affect using accessories.

Just being a worry-wart, but never hurts to ask.