Regarding this issue, the H61 and H81 motherboards have different CPU support, so they are not interoperable. H61 motherboards support second - and third-generation Intel Core i7\/i5\/i3 and Pentium\/Celeron processors with LGA1155 interfaces, The H81 motherboard supports fourth-generation Intel Core i7\/i5\/i3 and Pentium\/Celeron processors with LGA1150 interfaces. Therefore, if you want to replace the CPU, you need to choose according to the interface and processor type supported by the motherboard.
The cpus used by the H61 and H81 are not interchangeable
The pins of the two motherboards are different, and H61 is 1155, such as G620.G1620.i32100 and so on. H81 is 1150 stitches. For example, G1820, G3260, i3 4150 and so on