There will never be a major difference in feel between two different weights of the same bike because of swapped components. Every bike will feel roughly the same as it always had, assuming you didn't change features that mess with how it feels. With that said, a 18 lb bike vs. another 18lb bike could feel entirely different, in either a good or bad way. The weight will make a difference time wise, but if you aren't thinking about it, you probably would not notice weight differences on the bike unless they are 15lb+.