Mac uses own API, Metal. Windows uses own API, DirectX.
OpenGL is legacy on Mac. OpenGL relies on a legacy ICD ABI on Windows.
Vulkan uses MoltenVK on Mac. Vulkan either uses legacy OpenGL ICD ABI on Windows, or relies on DirectX 12 translation layer, while WSL relies on dxgkrnl, a VM host driver that translates GL/Vulkan into DirectX as well.
Pretty much alike.