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It is just two different package type. Like previously, the Core 2 Duo, Core 2 Quad, etc. were from the LGA775 package type.
Some boards can support LGA1366, others can support LGA1156.
Intel® Core™ i7 Processors exist in both LGA1366 and LGA1156.
Intel® Core™ i7 Processor Extreme Edition exists only in LGA1366
Intel® Core™ i5 Processors exist only in LGA1156.
Intel® Core™ i3 Desktop Processor exist only in LGA1156.
Here are the list of the Intel (R) Desktop boards and their respective package that they support.
All the best,