Yes you can, for as long as they are all WG7.x.
Make sure to properly setup the 'version checking in' "Advanced Management Setting" (if enabled), under "Central Management Configuration)
There is a slider that let's you decide the level of version check, from "Same major relase" to "same build number"
While the option may be there, we in support dont typically recommend doing this to prevent incompatibility.
For example, with 7.1.6, there exists properties, that are not in 7.1, so if you attempted to sync between the two on different versions, you may have a bad time .
Does 'not recommended' mean 'not supported'?
Shall the slider be all the way up to "same build number" under the option "version checking" ?
While the reasoning behind not recommending to synch 2 WG of different versions makes sense, I am wondering why the option of allowing the synch between "same major release" is present if it is known not to work properly?