Its an interference, so yes, The extent its damaged depends on engine RPM at time of breakage.
I have seen the results of a timing belt break at freeway speeds, it is not pretty, three Pistons had broken Valves jammed righ into them and the 4th was so badly nicked and gouged they were totally useless, not mention the damage the cylinder head and block had received, time for the scrap heap.
If your timing belt breaks you and your bank account will not be happy. Why risk it, get it replaced.
2005 Tucson 2.7 Belt broke coming awsy from a stop. Loud pop. Engine died. Resuts were 2 Exhaust/2 Intake valves slightly bent in Cyls 2 and 6 respectivly, Piston nicks very minimal. Lots of work to do yourself, but saved alot in labor (going rate today is between $125-$145. Also performed additional parts replacements while engine open.
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