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You asked:

is cream of tartar the same as citric acid

No. Potassium bitartrate is not the same as citric acid.
Potassium bitartrate
Potassium bitartrate
Potassium bitartrate

Potassium bitartrate, also known as potassium hydrogen tartrate, has formula KC4H5O6

citric acid

Citric acid, a weak organic acid