Groov to Groov Communication Codesys

I am using ethernet communication between two Groov epics in Codesys. Is there a guide on how to have them communicate?

Nothing step-by-step since it varies so much from application to application.
If you do a forum search on mmp and peer-to-peer you can find a lot of suggestions for swapping data back and forth, but again, it really depends on what you have in mind.