换汤不换药

Traditional (Taiwan): 換湯不換藥

huàntāngbùhuànyào ㄏㄨㄢˋ ㄊㄤ ㄅㄨˋ ㄏㄨㄢˋ ㄧㄠˋ

    • different broth but the same old medicine (idiom) a change in name only
    • a change in form but not in substance

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
change the broth but not the medicine
Meaning
Only the form changes while the substance stays the same. Critical; like 'old wine in new bottles'.

Sources