I am afraid the way you suggest is not technically feasible. Even compatible object versions can have different (additional) content so it is not possible to ensure that all data is consistent after merging objects from different versions.
So, the first step is to adapt the object versions used in the source project to the ones of the target project. The easiest way to achieve this is to create a copy of the source station folder directly next to the target station folder, so that both are using the same Std folder. Now, the version management dialog in the source project will automatically suggest the object versions required by the target project. After updating the versions, copy/paste between the two project should be possible.
... View more