Light vs dark rum for a recipe?

I don't drink rum so is there a huge difference in taste between the two? I'm cooking something that requires the dark rum but I only have the light stuff so will the flavor be really different or just the color?Light vs dark rum for a recipe?
the flavor will be off slightly, but you can mask it by adding just a bit of molasses or dark brown sugar to the rum. I'd suggest about 2 tsp of brown sugar or 1/2 tsp of molasses. If you don't have either, don't worry, the dish will be fine, just a little less ';authentic.';Light vs dark rum for a recipe?
The difference will be enormous. Dark rum has the aroma of molasses while white rum is only slightly perfumed. Use the dark one!