A, dry ice is solid carbon dioxide, composed of C and O elements, while ice is solid water, composed of H and O elements, and the composition elements are different, so A does not meet the meaning of the question;

B. sodium bicarbonate, commonly known as baking soda, has the chemical formula: nahco 3; Belong to the same substance, so b meets the meaning of the question;

C, quicklime is calcium oxide, chemical formula is CaO, hydrated lime is calcium hydroxide, chemical formula is Ca(OH) 2, and the composition elements are different, so C does not meet the meaning of the question;

D. Soda soda is sodium carbonate, which consists of sodium, carbon and oxygen, and caustic soda is sodium hydroxide, which consists of sodium, hydrogen and oxygen. The composition elements are different, so D does not meet the meaning of the question;

So choose B.