I took the liberty to compare v1.15 and v1.20 change lists and here are the 1.20 only changes:
FIXES:
* Railroads will always appear under captured cities if you have Steam Power.
* PBEM Games can not be loaded in Single Player
* PBEM: v1.20 Games can not be loaded on earlier versions. Earlier saves can STILL be loaded in v1.20
* PBEM: Previous players Civ can no longer be seen when loading a PBEM game
CHANGES:
* Histograph keeps tracking defeated Civs
* Electronics requirement removed from Motorized Transportation
* Radio Tech removed
* Civil Defense requires Electronics
* Advanced Flight now requires Electronics
* Radar Towers require Advanced Flight
* MPTournament: Tiny & Small maps can be played with 8 players
* MPTournament: Map sets Oceans to 40%
* MPTournament: Map Trading moved back to Map Making
* MPTournament: Enkidu cost raised to 15
* MPTournament: Ancient Cavalry defense lowered from 2 to 1
* MPTournament: Captured cities retain culture
* MPTournament: Turn slices lowered from 24(base)/3(per-city)/1(per-unit) to 16/2/1
* MP: City goodie hut spawns are not possible in Elimination Mode
ADDITIONS:
* Implemented Allow Scientific Leaders Rule
FIXES:
* Railroads will always appear under captured cities if you have Steam Power.
* PBEM Games can not be loaded in Single Player
* PBEM: v1.20 Games can not be loaded on earlier versions. Earlier saves can STILL be loaded in v1.20
* PBEM: Previous players Civ can no longer be seen when loading a PBEM game
CHANGES:
* Histograph keeps tracking defeated Civs
* Electronics requirement removed from Motorized Transportation
* Radio Tech removed
* Civil Defense requires Electronics
* Advanced Flight now requires Electronics
* Radar Towers require Advanced Flight
* MPTournament: Tiny & Small maps can be played with 8 players
* MPTournament: Map sets Oceans to 40%
* MPTournament: Map Trading moved back to Map Making
* MPTournament: Enkidu cost raised to 15
* MPTournament: Ancient Cavalry defense lowered from 2 to 1
* MPTournament: Captured cities retain culture
* MPTournament: Turn slices lowered from 24(base)/3(per-city)/1(per-unit) to 16/2/1
* MP: City goodie hut spawns are not possible in Elimination Mode
ADDITIONS:
* Implemented Allow Scientific Leaders Rule
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