Most addons for Call of Chernobyl have either been adapted or created specifically for Call of Chernobyl, so no, any CoC addon you see listed here will not work with Call of Pripyat. CoC is a standalone Call of Pripyat mod with many, many core changes making it practically it's own game.
However it has out of memory crashes like regular CoC. The one to keep an eye on is Call of Chernobyl - Back to the Roots, which is a fork of 1.5 R7 ported to Open X-Ray 64-bit engine (no more out of memory crashes) and includes STCoP 3.2 which is by far the best weapon mod in the series.
New Features (shortened): Completely replaced the weapon arsenal with BaS + selected weapons from Gunslinger and others. Added gunshot sound layering (different sounds for different distance ranges, JSRS style). Replaced the weather with CGIM 2 with dynamic weather managment. Added new a-life and respawn managment system from DSH.
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is call of chernobyl standalone