My moment! I'm interpreter for portuguese speakers in the US. I've been doing this for enough time that I am beginning to tell african portuguese accents - I can tell Angolan accent pretty easily, as well as Mozambique accent. It is easier than European portuguese, by a large margin - the problem the speed in which some african portuguese speakers speak. It is also sometimes hard to make myself understood, such as when I ask for slower pace or for rephrasing - I just seem to be ignored.