rear lower quarter sheet metal question?

[CARZ1968]

i have been told by a few manufacturers that the lower l/b pickup sheet metal (behind the rear wheels to the back bumper) is not the same as the suburban sheet metal b/c of the body line. My question is, my rust does not go as high as the body line, nor does it reach the reverse light. Would the pickup sheet metal be the same from the body line down and save me money? I can buy both sides of p/u metal for less than 1 side of the sub lower quarter!