Hello @moffitj
First rule of Graylog club, All version need to match prior to moving data over to a different node.
You could get version incompatibility errors when starting Graylog up on the new node ( I’ve done this already) and/or loss of data trying to fix those errors.
If this situation is moving from Graylog 2.4 node to a new Graylog 4.2 node, then the Upgrade path is need to be performed prior to moving data.
Also take a look at this post, it may help.