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TDA4VH-Q1: differences between vpacs

Part Number: TDA4VH-Q1
Other Parts Discussed in Thread: TDA4VH

Tool/software:

Hell.
running the same camera with the same configuration on vpac1(viss+ldc) and vpac2(viss+ldc) gives different time measurements.
they are not identical?
can I run both vpac's in the same time with two different cameras? 
(both are needed for machine vision pipeline, no need for human vision)