What's the difference between abracadabra and shazaam?

Abracadabra

Definition:

(n.) A mystical word or collocation of letters written as in the figure. Worn on an amulet it was supposed to ward off fever. At present the word is used chiefly in jest to denote something without meaning; jargon.

Example Sentences:

(1) He has seen couples with very low numbers of eggs "and, abracadabra, they conceive naturally."
(2) There was an abracadabra moment when he announced that net debt was starting to fall, sooner than expected, but surprise immediately soured when the Office for Budget Responsibility tweeted that £20bn in asset sales were flattering the relevant figures.
(3) The Press Trust of India criticised the film for its "exotic India package – snake charmers in red turbans, magicians who say abracadabra and slum dwellers who speak pukka English".