No, you need to know which Ethernet controller is present and add the kext to your OpenCore /EFI/OC/Kexts folder and add a companion entry for the kext to the OC config.plist.
This is not Windows were drivers are automatically installed. You the user needs to find, add and setup the drivers in macOS.
If you are using a B450 Aorus Elite V2 motherboard, then you will have a Realtek 1GB Ethernet controller on the motherboard. For this Ethernet controller you should use the kext linked in the 'Gathering Files' part of the OpenCore guide.
If you look under Ethernet section, the RealtekRTL8111.kext should be linked. Download and use this kext, see where that gets you.