I don't know for sure, but people who attempt to use the 79 prefix have trouble finding one that isn't already reserved. The stalker middleware does have the ability to use more than just a MAC to uniquely identify authorized devices, and the server people may have turned on that ability for the 79 prefix. That allows them to knock off those other users if someone with a picture of their MAC sends it into them if they have authentication issues. There is no such concern for those who use the 78 prefix, as you can change your linked mac at will. However, if you do use the 78 prefix, sending a serial number is essentially the same as those MAGS and Avovs sending their machine info, and so you'll be restricted to using the app that did send a serial number.
Short answer, Kodi could probably use the 79 prefix, and there are instructions on how you can use IPTV Stalker 1.0.18 to replicate other connections, but why bother if you have 16 million plus combinations of the 78 prefix.