Turbo off a Blown motor, need advice

If you're running turbo and you blow your motor, what are the odds that you've messed up or ruined the turbo as well. i know that this is a broad question to ask but i need some type of reassurance. I'm about to buy a kit and the seller is very honest saying he blew his motor, and he's not sure if the turbo works or not...but he believes it does. what are the odds that the turbo has gone bad...thanks for any and all responses.....