You are correct in your assertions,,, However you can/could/may have pwb changes to improve finished module performance, or cost, resulting in a new pwb with a lower rev level as its’ procurement part number would certainly change, and also resulting in a module assembly revision level change ( B to C?) and quite possibly an assembly part number and rev level change. It is all about tracking, and being able to determine (hopefully) what you are looking at and what documentation (schematics?) to relate to.
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