FCToTeXPreviewTermOrder[exp] displays the output of
FCToTeXReorder using the built-in Plus and Times but
preserving the original ordering.
Use ReleaseHold or FRH to allow Mathematica
return to its original ordering.
Notice that the output of FCToTeXPreviewTermOrder is not
suitable for algebraic manipulations but should be understood as an
intermediate expression form created to serve as an input for
TeXForm
ex = {(2*z*(11050 + 3438*L1 + 108*L2 + 75*NL + 150*NV + 12*Pi^2 + 432*Log[z]))/27,
(-13629 - 4452*L1 + 24*L2 + 380*NH + 75*L1*NH + 130*NL + 150*L1*NL + 130*NV +
150*L1*NV + 20*Sqrt[3]*Pi - 75*Sqrt[3]*NH*Pi + 360*Pi^2)/81, Plus}\left\{\frac{2}{27} z \left(3438 \;\text{L1}+108 \;\text{L2}+75 \;\text{NL}+150 \;\text{NV}+432 \log (z)+12 \pi ^2+11050\right),\frac{1}{81} \left(75 \;\text{L1} \;\text{NH}+150 \;\text{L1} \;\text{NL}+150 \;\text{L1} \;\text{NV}-4452 \;\text{L1}+24 \;\text{L2}+380 \;\text{NH}-75 \sqrt{3} \pi \;\text{NH}+130 \;\text{NL}+130 \;\text{NV}+360 \pi ^2+20 \sqrt{3} \pi -13629\right),\text{Plus}\right\}
FCToTeXPreviewTermOrder[ex]\frac{2}{27} z \left(11050+3438 \;\text{L1}+108 \;\text{L2}+75 \;\text{NL}+150 \;\text{NV}+12 \pi ^2+432 \log (z)\right)+\frac{1}{81} \left(-13629-4452 \;\text{L1}+24 \;\text{L2}+380 \;\text{NH}+75 \;\text{L1} \;\text{NH}+130 \;\text{NL}+150 \;\text{L1} \;\text{NL}+130 \;\text{NV}+150 \;\text{L1} \;\text{NV}+20 \sqrt{3} \pi -75 \sqrt{3} \;\text{NH} \pi +360 \pi ^2\right)