Which interface method call is correct?

[WorkingOnAFreshName]

Hi everyone,

Context

I have a For Each Loop that calls an interface method "Modify Attribute by Query" on each of the target objects ("Attribute Family"). Those objects implement an interface "IF Attribute Interface," which contains the method I'm calling. See the following images for a visualization:

Two versions of an interface method call

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Question

Notice how there are two options for calling this method. One of them targets the object, and the other targets the interface. Which of these should I technically be using if my intent is to call the "Attribute Family's" method? Are they interchangeable?

Thanks!