whyte 19 geometry?

I have just bought an 07 whyte 19 frame, it recommends a 120mm fork. I only have a 100mm fork! Would this ruin the bike geometry or could it take the 100mm without to much change?
Lee
Lee
2015 orange crush
2015 cannondale super six evo
2015 cannondale super six evo
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Of course, the real difference is the axle to crown height, not the travel. You could get a 100mm travel fork which is just as long as a 120mm fork.
Thanks for the help
2015 cannondale super six evo