Can you post some kind of link confirming the existence of an Apple "A1282"? Perhaps a photograph of the bottom case of the laptop we're discussing? Because neither Apple's support website, nor EveryMac. nor Mactracker lists an A1282 at all.
The closest thing I can find in the 2011 time period you're talking about is the A1286 15" Unibody MacBook Pro. The 13" Unibody MacBook Pros are all listed as A1278, from Mid 2009 until today.
The model number identifies the form factor; it doesn't identify the logic board inside the case. Logic boards may differ radically from one generation to another, with different screw placements/connectors/power requirements/port configurations and so on. The A1278 13" Unibody MacBook Pro is particularly troublesome in this regard, as Apple stupidly re-used the A1278 model number from the Late 2008 Unibody Macbook (Aluminum), which had wildly different parts and capabilities.
A much more reliable way to ID the generation of your Mac (and not merely the enclosure) is to use the Model Identifier. Launch System Profiler, located in /Applications/Utilities; the Model Identifier is visible in the Hardware Overview tab. It will be in the format:
You can also supply the last four characters of your serial number (actually, I'm not clear what resource other people are using to ID a computer just from those 4 characters. The only lookups I know are EveryMac and Apple Support, both of which require complete serial numbers. But enough people on iFixit ask for the last four characters, so clearly they know some site I don't know - I wish they'd announce where it is). Let's make sure we're identifying the computer accurately; otherwise our advice may get you into a lot of expensive trouble.
Generally, even if the model is the same and the ports/screw holes match up with the ones in your case, the only way to be absolutely sure when swapping a logic board is to use a logic board from the same generation as the original. The supporting modules (MagSafe, battery, GPU, display, Airport/Bluetooth, drives, heatsink, fans, speakers, sleep/thermal sensors) often use different connectors, cables and cable routings from one generation to another. Swapping a later logic board into an old box may not work unless you swap all the other parts. That's usually more expensive than buying a complete computer.
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