You can contact someone at iFixit (link on the bottom of the page)..this is the volunteer DIY help forum. The parts catalogue here says they don't work... a seller on ebay claims theirs do.

Even if it does fit it will not provide any significant (i.e. noticeable) change in use time on an older machine... much of the efficiency is due to the HASWELL low energy infrastructure CPU architecture by INTEL CPU and GPU/display changes.

It's sort of like saying... a new Chevy (or pic your automotive brand) gets more horsepower, or, better milage on brand XXX high test gasoline. I'll put the same gas in my two year old same brand and expect the same horsepower/milage... it ain't gonna happen. The new vehicle can have more plastic, different tires, improved fuel management computer... you need all the same pieces in place to get a near equal end result.

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