FIX: Output variable with differential pairs

[Samuelopez-ansys]

Description

Please provide a brief description of the changes made in this pull request.

Issue linked

Close #6129

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[ansys-reviewer-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.22%. Comparing base (e7a1acd) to head (a629e63).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6132      +/-   ##
==========================================
- Coverage   85.22%   85.22%   -0.01%     
==========================================
  Files         167      167              
  Lines       63619    63629      +10     
==========================================
+ Hits        54222    54230       +8     
- Misses       9397     9399       +2     

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[nefelimet]

LGTM