I believe your car has an interference engine. What that means is that the valves will hit the tops of the pistons when the timing belt breaks while the engine is running. Many different bad things can happen because of this. Valves can break or bend, pistons can break, chips of metal can damage the cylinder bores, heads can crack. You get the picture. Without some more investigation you won’t know what happened, but something did.
Buying a remanufactured head may well be a good choice, but a compression test and a leak down test will give some useful info before the head is removed.