This question is in reference to Atlassian Documentation: Managing components
Component as per my understanding is a unique value. Thus, why JIRA consider it as part of each project and not filter. i.e if ABC is component updated on 2 projects will show 2 different entry on heat map instead of 1.
This is not the distinct value as mentioned on heat map.
Your statement that each project has its own components list is correct.
The most closest analogue is a custom field having different contexts for different projects. Each context can have the same options, say A,B,C but they have different IDs. i.e.
Field Context for Project P1
Option A: ID=1
Option B: ID=2
Option C: ID=3
Field Context for Project P2
Option A: ID=6
Option B: ID=7
Option C: ID=8
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