Gateway Comm compatability between 8.0 & 8.1

Is it safe to assume that gateway comms between 8.1 and 8.0 are fully supported? Or are there certain features that will be incompatible?

The gateway comms between 8.1 and 8.0 is possible, but there might be some compatibility limits which you might run into.
Here is the link to a forum post talking about this exact scenario but with 7.9 and 8.1 connection: