Blu-ray disk quality?

Is it possible for a FotoMagico slideshow recorded and played back on a Blu-ray disk to approach the quality of the same show presented from within FM, assuming that both would be shown using the same high quality projector?

An export to any video format will always cause changes in terms of quality, this is because of the video codec that has to be used and that encodes the video.
If you use the HD export out of FotoMagico Pro and afterwards burn that video file to a BluRay you will however achieve a good result.