How do I create update statement that checks a field in related table, and sets to that value if it is different?

SQL 2005:
Problem:
I have a table of Items (Items) that has FK in table of order items (orderItems).  Both of these tables have a unitPrice field.  I need to update the orderItems - unitPrice if it is different from the Items - unitPrice.  It needs to be set to the value in the Items - unitPrice field only if they are different.

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