No, you shouldn't use names starting with a double underscore (i.e. __seq1, __seq2, __choice1, __shared1, etc.) explicitly. They are for internal use.
These generated names can be different in different versions of the ASN.1 compiler for C++. Use the scope resolution operator (::) to reference the anonymous SEQUENCE and CHOICE types.
Thus, for the definition above use A::b instead of __seq1.
The samples included with some of the Knowledge Center answers are meant for your general understanding of the OSS products. Different versions of the products might produce slightly different outputs. Consult the products documentation and samples for the most up-to-date products information and code examples.
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