Acrobat 6.0.2 professional produces wrong characters when distilling high asci-characters from FreeHand 11.0.2 on MACOS 10.3.4

I've noticed this with e.g. Univers, Helvetica Neue and Quadraat fonts, all type 1 fonts of which the pdf says they are embedded.
© (copyright sign) changes in ' (apostroph) ± (plus minus sign) changes in – (N dash) on my own computer but turned in ñ (n + tilde) at the printshop. è (e +accent grave) turns out as a blank space

How come?
Willem