Same chain.
Do not delete the v13 kore-testnet folder.


changelog:
1) Various fixes that enabled the fork process.

Select a compiled Linux 16.04, Windows 64 or the Source here.
https://github.com/Kore-Core/testnet-kore/releases/tag/v0.13.0.16

Linux compilation instructions here:
https://github.com/Kore-Core/testnet-kore/blob/master/README.md


OSX:
Working on it...