I have both modern and vintage. My 'modern' is pre-Mythiques, though.
I think they are pretty alike. No noticable differences whatsoever.
Don't get me wrong, I adore MdG, but, let's be honest; it is just a
plain citrus, it's limited how much can be ruined by a reformulation.
Modern (late 90s?) to the left - vintage (80s?) to the right.