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First-principles calculations of the stability, electronic, and magnetic properties of full-Heusler compound V₂FeSi and Fe₂VSi in regular (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>L</mi><msub><mn>2</mn><mn>1</mn></msub></mrow></semantics></math></inline-formula>) and inverse (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>X</mi><mi>A</mi></mrow></semantics></math></inline-formula>) structures have been performed using density functional theory within an SCAN meta-GGA functional. It is found that the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>X</mi><mi>A</mi></mrow></semantics></math></inline-formula> crystal lattice is energetically more favorable for V₂FeSi, while Fe₂VSi forms the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>L</mi><msub><mn>2</mn><mn>1</mn></msub></mrow></semantics></math></inline-formula> structure. In both cases, the electronic structure of the energetically stable modifications corresponds to half-metallic ferrimagnets. Magnetic properties of energetically favorable structures obey the Slater–Pauling rule. All considered properties of the studied structures are explained within the crystal orbital Hamilton population analysis.