Furthermore, good training is the issue here, good training and exposure. We do a lot more than the minimum required training advertised by the manufacturer. We do 3 days groundschool, CBT and performance and 4 sim sessions,including the JAR-FCL Checkride.
This is followed by 4 Linetraining flights and 1 linecheck.
Then for some time you are dedicated to NG-aircraft. After this time mixing is allowed by the CAA when enough exposure on both types can be maintained.
Safety is no accident....