Jasper,
Have you tried to configure the ServiceNow connector and haven't had any luck configuring the connector. Based on a quick search looking around ServiceNow there appears to be a few different versions. I wouldn't think that there would be major API changes to how Datalink Connects to ServiceNow between the versions.
I would suggest to leveraging the ServiceNow Connector Guide and if anything seems off I'd report back through Support so P&E can improve the documentation if necessary.
Thanks,
Ryan