Levi'sMen's 501 Original Fit Jeans (Discontinued)

I wear a 33x34, what size should I order?

What's the difference between natural fill and regular 501s shrink to fit??

Would you be able to explain the bullet that says "Zip fly with button" on the cobalt blue ones when everything else says button fly?

Are the sizes 38 36 the same as 38x36 ? I need to know before I order