An example:
I'm running the 1.02 opt-in version and I'm interested in the Yor "Reproductive Augmentation" tech in the Propagation branch.
If I start a new game in 1.02, the bonus reads "+1 Synthetic Population Cap". If I do nothing but research to this tech, I see the pop. cap of my homeworld Iconia increase correctly.
Now...I have an old Yor save (from 1.00 or 1.01, not sure) where I have not yet researched "Reproductive Augmentation". When I load this up in 1.02, the tech bonus reads: "+2 Adjacency Bonus" -- i.e., it's different (I presume this was the old version of this tech). When I research it, nothing changes.
So....it seems like if you use an old save game, the tech is not updated for the new version.
(I discovered this while answering a question here: https://forums.galciv3.com/465926/page/1/#3557901)