If you add or subtract a few ions you can come up with something chemically similar. I don't know in what context he was talking. Both can be used for recreational purposes. I don't know what else he could mean.
There is... and there isn't. Morphine is an opiate. Dextromethorphan is an analog of an opiate ( meaning that it was engineered from an opiate). It does it have any of the usual opiate characterictics, such as anesthesia, sedation or physical withdrawal.
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