If you mean the connection of the camera to the Mac to download pictures you shoud have no problem. Both cameras will for sure be seen by the Macs as external disc. I have to say taht usually I prefer to take out the card ando copy the pictures from card to my Mac.
Than you can use iPhoto or other Software to organize and edit your photos on Mac and there will be no problem.
I do not know if this cameras also take raw. In that case also the raw files will be very probably seen by iPhoto or Aperture. Canon also supply its own software to manage pictures: it should be also a Mac version.
I had an S80... no problem.