Diffing_Engine: Performance of IsEqual improved

[pawelbaran]

Issues addressed by this PR

Closes #3427

Test files

DiffingTests_Prototypes

Changelog

Additional comments

[alelom]

Tested with DiffingTests_Prototypes, and reviewed code. Agreed with @pawelbaran on a call that this is an improvement and doesn't affect the BaseComparisonConfig functionality.

[pawelbaran]

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