This information applies to all versions
DxO PhotoLab’s sidecar files (*.dop) are not compatible between Windows and macOS platforms.
A .dop file created on Windows can only be used with DxO PhotoLab for Windows, and a .dop file created on macOS can only be used with DxO PhotoLab for macOS.
Similarly, DxO PhotoLab’s database is not compatible between Windows and macOS platforms and cannot be shared or migrated from one operating system to the other.