Only way to tell is to test it. I did some testing for Museo years ago when the switched paper suppliers. I only asked for 10 or so letter size sheets and they sent me a roll of paper!! I found no difference between the old and new paper stock. I printed three sheets of random color patches along with a 51 step B/W patch set, read them with an i1 spectro and compared the two sets of readings there was no difference between the two. Maybe there are other ways to do such a test but I found this to be the easiest. It will not tell you anything about print permanency.
Alan