In favor of greater historicity and realism, the following have been changed: seas, rivers, forests, mountains.
The changes (almost) do not concern coordinates of settlements, agnets, resources, etc.
With luck, you can continue the old campaign.
Instruction:
1) Install SS6.4 link or SSHIP 0.98 link.
2) Create a backup of the folder data/campaign for SS6.4 and data/world/maps/base for SSHIP.
3) Download this file and unzip with replacement into the mods folder SS6.3 / SSHIP_0.98 folder.
4) In SS6.4 run SS_setup and select the campaign, SSHIP immediately start the game.
Stainless Steel 6.4 Moddb.com
Stainless Steel Historical Improvement Project 0.98 Moddb.com