Yes, gravel bikes will tend to have a shallower head angle, that will shorten the top tube by about a cm per degree, you can make this reach up with a longer stem if you want. The net result is more weight over the front wheel and slower steering. Gravel bikes will also have longer chanstays, and hence a longer wheelbase for more stability, they may have a shallower seat tube too.
You can reproduce a road bike position on a gravel bike, but there will be a slight weight redistribution for more stable handling. Saddle fore and aft, and stem length may need to be changed to achieve this same position. My road and car bikes and my mtb have pretty much the same rider position as measured by relative locations of contact points.