Changing which PayPal credentials are used for taking payments will not delete all your order history.
There's no built-in way to delete all order-history, short of manually clicking on each order and choosing Delete ... one-by-one. Same with customers, products, etc.
So, unless you did that, or wiped the store by replacing the entire database contents, the data should still be there.
You should be able to confirm that the data is present by looking in the database using your hosting company's phpMyAdmin tool to look at the "order", "orders_products", "orders_status_history" etc tables.
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