Watchkit: table with two templates in dynamic rows

You want -[WKInterfaceTable setRowTypes:]:

[self.myTable setRowTypes:@[@"RowType1", @"RowType2"]];
MyRowType1Controller *row1 = [self.myTable rowControllerAtIndex:0];
MyRowType2Controller *row2 = [self.myTable rowControllerAtIndex:1];