Lightning addresses don't store funds, they're just a gateway to generating an invoice. You wouldn't be able to say that the sat you got back came from the same address, because no lightning sats come from addresses.

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I see .. I need to dig deeper into this .. but if I send you some sats from say my address shutosha@primal.net .. wouldn't you know who sent you money ? That seems strange though

Here .. see the lightning address of sender is right below the name ..

That's saying that the zap came from that nostr account, not that the zap came from that address. You can send zaps from sources other than how you receive them.