They are different. NADH(Nicotinamide adenine dinucleotide) has a chemical composition of C^(21)H^(27)N^(7)O^(14)P^(2). While NADPH(Nicotinamide adenine dinucleotide phosphate) is C^(21)H^(29)N^(7)O^(17)P^(3). As you can see, slightly different chemical compositions. Also, while NADH is used in cellular respiration, NADPH is used in photosynthesis. But, I am by no means a expert, so feel free to correct me.
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