Binghamton vs. other SUNYs: rigor

Are the classes at Binghamton necessarily harder than those for, say SUNY Albany for example? I have heard that most of not all SUNYs use the same textbooks, which struck me as odd. Would one be more likely to have a higher GPA at Albany being a top student vs. being middle of the pack at Binghamton? And is this due to a difference in actual rigor and class difficulty or just because of classes being graded on a “curve”?