The A380 can make up surprising amounts of time - the main factor will be weather rather than a/c type (and Eurocontrol for EK12).

You shouldn't worry unless it's an hour or so late in which case you have less of a chance of the connection.

At DXB if you don't see someone with a sign with your onward flight somewhere between disembarking (they are usually in the terminal where the lower and upper deck disembarking areas merge) then run to the next gate as it means EK think you can make the connection.

If there is a person with a sign it means either you've already been offloaded and rebooked or they will cut the queue at security and escort you to the next flight.

Bags can easily make 45 min connections at DXB - 8pm is not the busiest time there.

It is highly unlikely EK will endorse you over to another carrier: you would have to press the point if that happens or ask for BKK or SIN. BKK has 3 flights arriving in the morning or lunchtime at BKK you could make.