I exported every saved object (indices, searches, visualizations and dashboards) from an instance of Kibana 6.4.0 to another instance of Kibana 6.2.4 .
The problem I encounter is after the import, the size of the panels in every dashboard is different on Kibana 6.2.4 then Kibana 6.4.0, specifically it is bigger. Every panel in the dashboards is bigger, apparently by the same factor. Doing the opposite (exporting the saved objects from kibana 6.2.4 to kibana 6.4.0) results in the panels appearing smaller.
To do the import I use a ruby script I wrote taking advantage of the kibana APIs, and I take care of the differences in the API since the API of Kibana 6.3 made a few important changes.
Did anybody else have got the same problem?
For reference, the ruby script is here https://github.com/BarcoMasile/kibana-import-export