Brake line wall thickness

[01somta]

I went to a local auto parts store and pickup up a 6ft stick of 3/16" SS brake line for my rear axle line. Today I called another place about getting a longer stick (15-20ft) for th MC to rear axle, I called them because the auto parts store longest length was 6ft and I wanted to eliminate any extra splices that weren't manditory. I got the specs on the 15-20ft stick and it has a wall thickness of .035", so I then called the auto parts store and their line that I bent and flared for the rear was only .028" wall thickness. Obviously the thicker the better, but is .028" ok to leave for the rear and do the MC to rear in .035" or redo the rear line also? The entire rear line will also be covered in gravel guard if that makes any difference in protection.

Thanks Dustin