Changing PayPal Accounts....HELP

I have a client who needs to change the paypal account associated with his subscription website.
Do the members subscriptions automatically switch over to the new paypal account we enter or do all the old member's subscriptions keep going to the old paypal account?
Do the members subscriptions automatically switch over to the new paypal account we enter or do all the old member's subscriptions keep going to the old paypal account?
