The trackpad on my everyday machine (mid-2009 MBP) is no longer clicking. I have an older 15" MBP, released in late-2008. It's the one with the first unibody design: newer black backlight keyboard but with an easily removable battery (ifixit.com/Guide/Installing+MacBook+Pro+15-Inch+Unibody+Late+2008+and+Early+2009+Battery/819/1). The trackpads appear visually identical from the outside. Can I take the trackpad from my old 15" and use it to replace the one in my 13"?