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dracop said..
Wider bars will splay out the canopy of the kite by forcing the wings open, causing the kite to fly strange.
I'm gona call boolarks to that statement!... unless you are using stupid short lines it will make no difference what so ever if the bar is 40 or 60cm wide to the kite shape!
What it does change is the impact to the turning input you put into the kite. Ie smaller bar give less turning input larger bar more.
I run one bar size 50cm from 13m to 6m for my kites.
Short answer is yes it will work. The kites mind be a little more reactive. I see no disadvantage on using bigger bars for smaller kites (apart from the physical size might be annoying) if you can handle the faster response the bigger bar gives you.