I wish I could give you a definitive answer but I can’t. The Propel (at least the one I purchased) came into the store with a whole mess of spacers fitted. The store mechanic then removed several to get me near the number I have from my bike fit. We then tweaked from there.
As I mentioned, I went from a 56 inch CAAD12 with a 100mm stem (-6 degree) to a 54 inch Propel. I do run 15mm of spacers on my CAAD. Comfort and position on the bike wise, I can only tell the difference when I’m in the drops because the drop is slightly different.