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While the case bodies are similar, the 1G and 2G are different and the button placements and width of the cameras vary - this impacts rear housing button line-up and extensions.
You should have tried it with battery in and you would have found that the Mode, Flash, Macro, Menu, and Fn2 buttons do not reach and/or line up in order to depress and activate on the camera. The top/front housing buttons do line up and can function - power, zoom, Disp, Adj, and command.