Hello,
If you go to celestron.com.au, they have the piccies and specs for both. Quick look is the mount is different in appearance only. Specs places the mount head(7kg), tripod weight(5.44kg), instrument load capacity (11kg) etc the same for both packages.
There is only 1.1kg difference between the two scopes total weight package as well, the 8" at 5.44kg takes a lot of capacity if you want to keep the loading to under 80% and run imaging .
Steve
https://www.celestron.com.au/product...ar-evolution-6 (4.54kg)
https://www.celestron.com.au/product...ar-evolution-8 (5.44kg)