The 500 dollar bill has a portrait of William McKinley on the face of the bill.
President William McKinley
President William McKinly was on the $500 bill.
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The face from the U.S. President Abraham Lincoln.
20.00 dollar bill 2 face
Lincoln
A 1 dollar bill with two different serial numbers is not considered rare or valuable in most cases. Its worth would still be the face value of one dollar. However, if the bill has any significant printing errors or unique features, it may be desirable to collectors and could potentially be worth more than face value.
A bill's serial number is just a counter so including it in a question generally doesn't help to identify it or affect its value. There are collectors who will pay a premium for bills with low or patterned serial numbers; e.g.12345678 or 00000005. Please post a new question with the bill's date, and whether there is a small letter next to the date.