Problem on DiracTrace & TR

<< HighEnergyPhysics`FeynCalc`

t = 
      I ((el^2)/(16 (Pi^4) (1 - D))) FAD[{q, mf}, {q - k, mf}] 
          DiracTrace[(mf + GS[q - k]) . GA[μ] . (mf + GS[q]) . 
              GA[μ]]  //  FCI
s = 
      I ((el^2)/(16 (Pi^4) (1 - D))) FAD[{q, mf}, {q - k, mf}] 
          TR[(mf + GS[q - k]) . GA[μ] . (mf + GS[q]) . 
              GA[μ]]  //  FCI

OneLoop[q, t]
rst1 = FullSimplify[%]

OneLoop[q, s]
rst2 = FullSimplify[%]

rst1 - rst2 // Simplify