different between ingratiating vs kowtowing

English

ingratiating (comparative more ingratiating, superlative most ingratiating)

Which ingratiates; which attempts to bring oneself into the favour of another, often with flattery or insincerity.
That was an ingratiating smile.

ingratiating

kowtowing

kowtowing (plural kowtowings)

The act of one who kowtows; a submissive bow.
- 1910, Robert Ames Bennet, The Shogun's Daughter
  Yoritomo met their smiles and kowtowings and noisy insuckings of breath with an austere dignity that I took pains to imitate.

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