Pathophys for Boards & Wards Step 1 vs. Step 2 & 3

[AlexRusso]

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Pathophys for Boards & Wards

Step 1 version

vs.

Step 2 and 3 version

Any major dofferences between the two. I was comparing them and noticed that they are very similar. I have the Step 1 version. Is the Step2 &3 version worht buying???