I missed that the Arial font is different. The explanation is here (in Section 6.3 and 7), and you’ll need to use the FontList.txt feature to ensure that FormMagic uses exactly the same Arial font you’re using: https://www.id-extras.com/help/formmagic/
(The solution you posted above may work, but I suspect only if you’re using a rich text field. If you use a plain form field (not rich text), I think you’ll still need to use FontList.txt, as above.)
To make sure the colour carries over, don’t use tints – best to use a 100% swatch of the colour that you want.