Think it depends on where the weight is. If you stick 2g of lead or put a dampener at 12 O'clock it will make a difference when you swing. The same weight at 6 O'clock will be less noticeable.
If the balance on both racquets is the same, the weight difference is much less noticeable.
That said, I finally gave in yesterday. I couldn't feel the difference but just knowing it was there was enough. I ended up adding 3g to my lighter stick. Now they are identical !