Is the tourist charging socket in Vietnam the same as that in Chinese mainland?

The sockets in Vietnam are all round holes, and the voltage is the same. If your mobile phone is also a round hole, you don't need to bring a converter, but if the mobile phone charger is flat and has three plugs, you need to use a converter.

Extended data:

Asia Pacific region?

Area name (Chinese/English), voltage, frequency and plug shape

China/China: 220V, 50, DC, two feet/splay.

Vietnam/Vietnam: 120/220v, 50Hz, A.B.E.G. Round feet and flat feet.

References:

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