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Tutorial
The JavaScript language
Objects: the basics
Constructor, operator "new"

Two functions – one object

importance: 2

Is it possible to create functions A and B so that new A() == new B()?

function A() { ... }
function B() { ... }

let a = new A();
let b = new B();

alert( a == b ); // true

If it is, then provide an example of their code.

Yes, it’s possible.

If a function returns an object then new returns it instead of this.

So they can, for instance, return the same externally defined object obj:

let obj = {};

function A() { return obj; }
function B() { return obj; }

alert( new A() == new B() ); // true

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