While I never did Int'l to Int'l connection in CPT, there is signage towards international flight connections, so IF your bags gets through-checked or you can travel with hand luggage only, you probably don't need to clear immigration at all.
For the rest I agree with [MENTION=212789]wijibintheair[/MENTION], but the possibility of being stuck in the immigration queue behind EK770 is very real even if it is ontime or just slightly delayed, for the peace of mind you could book the meet & greet service.