Do you want to continue using your existing CODESYS V2.x Web-Visu Applets under CODESYS V3 / e!COCKPIT? With SpiderControl it is possible.
You will need the SpiderControl PC HMI editor and SpiderControl SCADA server for PFC controllers. So you can use your existing HMI on the new Wago PLC without further adaption. This can be done under CODESYS V2.x as well as on e!COCKPIT / CODESYS V3.