For CPUs and motherboards, there are not interchangeable. For example, an LGA1155 CPU will not fit in a LAG1156 motherboard and an LGA1156 CPU will not fit in an LGA1155 motherboard.
Shortly after my motherboard was made, they changed standards, so I can't easily upgrade my CPU.
Answers & Comments
For heat sinks, apparently nothing.
For CPUs and motherboards, there are not interchangeable. For example, an LGA1155 CPU will not fit in a LAG1156 motherboard and an LGA1156 CPU will not fit in an LGA1155 motherboard.
Shortly after my motherboard was made, they changed standards, so I can't easily upgrade my CPU.
Intel Sandy Bridge Details of the next gen
Good luck.
Paul