Featured content list - what is the difference between TargetContainerId and ContainerId

In the options for featured content list v2 there are 2 similar values can someone please explain the difference between the 2 ?

FeaturesListOptions (v2) In-Process API Supplementary Type

TargetContainerId  and ContainerId

I have tried locally with some featured content in a group, setting either of the above values seems to get the same response

I would appreciate some explanation as to the usage of the 2 values and how they effect the results
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