@sega I don’t know enough to answer your question intelligently.
I can tell you that for multicast imaging FOG uses the linux commands udpsend and udpreceive.
I don’t see any command line switches to pick which igmp mode is being used.
https://users.soe.ucsc.edu/~kent/test/udpcast.html
I can say its rare that there is ever a question on the revision of igmp being used.