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Is it possible? Or there could be some conflicts?
This question / problem has been solved by TerriblePurposeimage
I may be possible or not, depending on the game. In some games you can even share the same save.
Is it possible to know wich game specifically you want to install both versions?
The first thing I was thinking: Why?
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Bazikonn: Is it possible? Or there could be some conflicts?
As noted, depends on the game. I have both the Steam and GOG version of No Man's Sky installed. They use the same save space, so I just make a copy of it and rename the folder to NMSGOG or NMSSTEAM, depending on which one I'm playing. This may or may not work with other games.

Games that don't have registry entries can probably be installed without issue. Just install them to different folders or even different drives, and you should be fine.

But yeah, depends on the game.
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teceem: The first thing I was thinking: Why?
It's way easier to run earlier versions of GOG games then Steam. So, you could run an older version of the GOG game and a current version of the Steam game.
Post edited January 03, 2020 by TerriblePurpose
Yes, cross the streams. It is the only way
Some games use the same save file like Fallout 3 GOTY and TES4 - my GOG and Steam version use the same save file. But as others have said why would you install the same game twice?
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Dark_art_: I may be possible or not, depending on the game. In some games you can even share the same save.
Is it possible to know wich game specifically you want to install both versions?
Chasm
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jepsen1977: Some games use the same save file like Fallout 3 GOTY and TES4 - my GOG and Steam version use the same save file. But as others have said why would you install the same game twice?
I DO WHAT I WANT
Doom 64 and Quake Enchanted will pick up Steam saves and downloaded official mods.