Does my hanging light have to Match other lighting in the house?
Depends on the design of your house and the proximity of the fixtures. If the overall character of the house is similar, you may want to keep everything similar. However, we often "mix-it-up" if different areas are "different ".  Especially, if the "different" area has an unusual ceiling: (I.e.: different shape, height, color, use, etc.) 

If the fixture can't be seen from another fixture, I doubt anyone will notice.