I agree with Bruce, the print in the second one certainly is fogged. I've encountered problems with mottling, kind of similar to the first one from old paper.
One way to test for fogging is to divide a sheet in half, without exposing, develop, stop and fix one half and only fix the other. They should match, if there is tone in the developed half it is from fogging. Ideally you should do this in complete darkness, especially if you haven't tested your safelights.