Do Macs Have Custom Models of Intel Processors?
They are identical. Don't know if we are allowed to talk about it, but all I can say is to search osx86project or tonymacx86, you will see the hardware.

List of iMac and Macbook hardware and history.

If you search the Intel chips the Macs are using (eg. i7-4770HQ), you will see Windows laptops are using them as well.

Mactracker is an OSX App and an iOS App that has all the details from the first Mac to the last Mac.