I thought these are two words for the same thing.
In Lost stories was a question answered with "Building a Better Past" by tendertouch.
I clicked on the link and on the title page there are both:
'Foreword' followed by 'Prologue' and then 'Chapter 1'.
I haven't started reading so don't know yet why the author differentiated between both.
My question is to you other authors, do you differentiate between foreword and prologue?
HM.