Lightroom has a sync metadata option where you can choose which metadata to sync. I know Imatch has copy and paste metadata. But does this mean that Imatch copy everything or can you choose?
https://www.photools.com/help/imatch/#md_panel.htm
The Metadata Panel has options to copy selected metadata (see the link above by sinus), especially Tips for Copying Metadata (https://www.photools.com/help/imatch/#md_panel.htm?dl=h-28)
You have very fine control about which data you copy with Copy/Paste Attributes command, see Copying Attributes and Metadata Between Files (https://www.photools.com/help/imatch/#paste_attributes.htm)
IMatch's unique File Relations: Versioning (https://www.photools.com/help/imatch/#rel_versions.htm) concept usually means that you don't need to manually copy data between files, versioning does that for you.