Procedural texture scaling changes note picture A the flakes are bigger than flakes at B. Why this happens ?Texture should be identical!.
Note: A & B are two different objects with same material. Scale is also applied.
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I don't see any textures in your object, which would be helpful to diagnose texture related issues, also your node tree screenshot is barely visible which doesn't help either.
Anyway, you seem to be using both Generated texture coordinates and UV texture coordinates, both of which can vary by object, the former depending on the geometry's actual dimensions, the later depending on its current UV layout.
Use either Object texture coordinates or World based ones if you have different scales across objects.