You sent me sats on a custodial wallet from a custodial wallet using Lightning.
Does it matter? No. Or you now says that sats from a custodial account are not the same sats ?
I could pay also a zap on SN from an anon wallet (external wallet) that have nothing to do with SN account.
OK, please send me an invoice of 100 sats. I will pay it from any other LN wallet. Apply the same.