Question:

Why have my routing results changed?

Answer:

 

Even between maps from the same dataprovider - it is possible that street segments changes in length and/or orientation.
That can lead to different results - normally they are so small that you will not even notice them.
When you switch from an old RouteOptimiser Version to a xServer 2 version, it could be that your Map data provider changed. From TomTom to HERE. There it is possible that some results will noticeably will change.