The “approach” to some gravel roads in my area are so steep mountainous paved roads. As such, I’ve ridden them several times on both a 18lb road bike with 25mm GP 4000’s and a 22lb gravel bike with 38mm Gravelkings.
I’m pretty evenly split on my PR’S on certain paved segments between both bikes.
The road bike feels faster but at the end of the ride, there is very little difference.