If you do more AP things with your second child than you did with your first, does your first get jealous? Like, what if you nursed your second child longer, or had your second child at home and your first in a hospital, or want to co-sleep with your second when you didn't with your first?
I imagine it would depend on the age difference of the children.
Maybe an older child might look at it that way... in my case none of them really noticed to be perfectly honest. Then again the 3 of them were born in just over 2 1/2 years.
Now that I think of it, I don't think a child would think that way "Hmmmm, mom bf me for 23 months but now my sister is 35 months and still bf, does she love her more?"
I think that attached children feel secure and loved because of what they received and (in my opinion) that doesn't change when they have a sibling who also receives the same love & care, even if certain things happened differently or a bit longer.