Is the 15th edition of General Zoology Laboratory Guide different from its older version?

Is the 15th edition of General Zoology Laboratory Guide , by Charles Lytle, John Meyer, different from its older version ( the 10th ? the 13th ?)
If it is familiar I can buy an older version online for much cheaper. Please help if you know !!! Thanks so much!!!
Update: A lot of books has no actual updates but the edition numbers in order to receive more profit from buyers. That's why I'm asking
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