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The violin's usual sound pierce a bit more (richer in harmonics) than the viola usual sound... (but then... it might depends of the player). But honestly the difference with professional players won't be that much big for a medium register. It might make the harmonics of the of the viola part stands out more and thus becomes more metallic... but this depends of the intervals you use of course... if they reinforce the harmonics of the viola or not.
Another think to consider (that has more effects) if the string you use on each instrument... for each strings has their own sonorities.... these sonorities should guide you more for orchestration than the idea of putting an instrument in a different position... it's the difference between a concept (the viola over the violin) and an 'effect' or an alternative timber (using a D string of a violin under a C string of a viola for example).
That is as much answer I can give... more than that I would need help ! eheh
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God only brings wars... might music entertains us from it !!
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