ΔE 12.8, fair: the same colour family, but not a straight swap. Mars Yellow is noticeably lighter, more saturated, warmer than Molten Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Mars Yellow is noticeably lighter, more saturated, warmer than Molten Orange.
The same difference applies the other way round: Molten Orange is noticeably darker, more muted, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Molten Orange on the colour wheel See Mars Yellow on the colour wheel
All matches: Molten Orange equivalents · Mars Yellow equivalents