Are all 'Beyond the Sword/CvGameCoreDLL' sources the same?

Don't bother with the "stock" BTS source code, it is obsolete by now. During the 10 years of so since 3.19 there has been a number of unofficial patches and various other improvements (found scattered around in various mods) which should be the minimum of what you should consider as your starting point.

The leading mod in terms of bugfixes, performance and AI is currently Advanced Civ. Second to that is probably K-Mod 1.46, but you would have to backport a number of fixes and usability improvements from Advanced Civ at the very least.

Note: I am assuming that you primarily want the BTS-style gameplay, albeit with some minor balancing\tweaks.
 
Thanks for advice to look to advanced-civ mod. I came across it few days ago.

Seems that it alters game rules significantly. There is a PDF file (docs) with rationale / explanations behind changes. But still it is not vanilla BtS experience... Should check docs at try to play to say more.
 
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