Enharmonic F# and Gb are the same, however F3minor and Gb major are completely different as stated above.,
Asuming it is just a typo and the discussion was really about F#min and Gbmin, it still would mean a serious difference to reading musicians:
F#min: F# - G# - A - B - C# - D - E
Gbmin: Gb - Ab - Bbb - Cb - Db - Ebb - Fb
Peter