But psychologically, there is a difference. Marketers well understand this.

If you are OK with a price, then a discount seems like a possibility, but you know you are already OK with the price.

If you get a price and then find there's a surcharge or add-on to actually pay for the item, you are furious, and often either strive to avoid it, or cancel the purchase entirely.

But, yes, of course, the net price is the same either way. It's the experience that's different.