is the engine in a 91 honda accord lx an interference engine?

It's quite possible, especially on a DOHC, more likely the higher the RPMs when it happened. Typically Honda engines are quite efficient, part of this is a result of very good airflow and close tolerances.
 
Yes it is an interference motor.

You should expect valve damage at the least... If it was running when it happened, it could be worse.
 
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