Assuming your
2017 27" is an iMac then it has Bluetooth 4.2, your 2012 MacBook Air has Bluetooth 4.0, and the
Magoc keyboard according to Apple has bluetooth with no specified version that I could find. Because of its low power consumption I would be inclined to believe it is Bluetooth 4.2. My experience is with Bluetooth 4.2 and it is excellent.
The latest Apple PowerBook Pros have Bluetooth 5, but the current iMacs are still using Bluetooth 4.2.
This Wikipedia article will explain the differences in the various versions. But assuming Bluetooth 4.0 or later, you should not have any problems.
