FZR600R engines, Fazer 600 will fit, not sure about the YZF as I'm pretty sure the frames are different - the YZF, for example, is an aluminium deltabox whereas the Thundercat is a steel version - the YZF engine leans further forward than the 'cat too ..

The 600 Fazer used the same engine as the 'cat although it's slightly de-tuned ..

You should be able to use the same looms for all, although you'd be wise to match the ECU's to the engine.