On my touring bike, about a year ago, I upgraded my tires from the low-end stock ones to better lighter ones. The weight gain was 205g per tire so 410g on the whole bike, plus a few grams on the tubes that were smaller ergo lighter since I reduced my section.
This made a huge difference in the reactivity, and the overall velocity of the bike.
Now for my racing bike, I intend to replace the wheels from the heavy stock ones to higher end ones. In addition to features such as stiffness and so, the new wheelset will be 410g lighter and I will gain a few more grams with a cassette change.
So weight-wise, the gain is very similar, will the feel be similar as last year? since this weight gain is also done on moving weight