It's pretty elementary physics. Your grip hand is the fulcrum. As was said, if the grip hand is placed at the balance point, then every cue with the same balance will feel the same. However, by gripping the cue elsewhere, you move the fulcrum & are then altering the leverage that is dictated by where the most weight resides. Sounds complicated but it's actually not.
Let's say a cue is naturally 15oz. but has a solid lead 4oz weight placed 18" from the bumper to achieve 19oz. The cue's balance point may rest at 19" but when you grip it a few inches above the buttcap, it'll feel crazy front heavy.
Take another cue with a natural 18oz weight & put a 1oz weight at the very back to achieve 19" balance point. Gripping the cue a few inches up from the buttcap will place your grip hand in front of the added weight & the cue will not feel so front heavy because the weight is more evenly distributed. Does this make sense?
There's a lot more to building a cue than meets the eye. Weighting & balancing a cue is a science. It's not easy to consistently reach a particular weight, balance & overall feel.