Historically speaking, you could get away with just moving the .log files and everything else would regenerate.
However it's a little more complicated these days as aside from the pointer files, there are indexes used by SmartLog and SmartEvent.
Refer to the "Importing Log Files from SmartEvent Servers" section of the following document: Logging and Monitoring R80.10 (Part of Check Point Infinity)
In short, you need to copy all the files (.log and related pointer files) and tell the indexer to index files older than 14 days from the date of initial server installation.