Channel check = insider trading??

I've gotten some mixed feedback and am a bit confused on the following scenario:

Suppose I'm researching Public Company A.  I find someone at Private Company B that is a customer of A who provides ballpark figures of how much sales B does with A and how that has changed over some annual / quarterly time frame.  A doesn't publicly disclose any of these specific sales with its customers.  Is that considered insider info on A?

Does the scenario change if both A and B are public companies and neither publicly discloses its business with each other?  

Note I'm looking at this as an individual investor / for stock pitch purposes so looking for the purely legal requirements and not any internal compliance policies.  

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