I could say the same even about how I grew to love my firstborn vs 2nd and 3rdborn. The first one was kind of terrifying. The uncertainty, unknowns, all of that. Normal territory with having a first kid!
The 2nd and 3rd I love as much, but the process in how I grew to love them was more immediate. The initial meeting them was not as stressful, less expectations on how things are "supposed" to be ;)
I would assume adoption to be similar to the description on my firstborn? So many questions on how things are going to happen and progress? So excited and everything, but extra layer of "what are we doing!!?"