Hi!
I just want to share some of my chat information that I collected when tested difference between CIS and ENG/EU versions of game (EU versions are English, German, Italy, Polish etc.; CIS version use russian language). You can add extra difference or said that something is not correct in comments:
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CIS version was released in 2003; ENG/EU - in 2004 (source: Download Angels Vs Devils (Windows) - My Abandonware)
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Target lock: CIS doesnt have, ENG/EU versions have it.
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Belze and Gabriel solo campaing: CIS doesnt have, ENG/EU versions have it.
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Hitboxes: in CIS - npc and items have smaller hitboxes than in EU versions.
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Camera movement: CIS has better vertical movement of camera (probably related vith target lock).
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Jumping: CIS version have worse move-after-jump movement (almost always after jump there is a recovery frames; related with high of jump - if you land on the same X-cooridnate as on the start of jump, there is recovery frames). It ruins run-and-jump movement strat that is possible in EU versions.
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Invisibility: in CIS version even on Easy difficulties evemies will attack you agressively, in EU version it works better.
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Wisps. In CIS version they extremely hard, they always fly high when you near them. In EU - they are so passive.
Will add details if find anything new. Feel free to add extra things in comments. Good luck!