json - Compare two StdClass objects with PHP

I have two objects, which are the same, but written in different methods. One is JSON (decoded):

$object1 = json_decode('{"null":null,"int":1}');
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And one is StdClass:

$object2 = (object)[
    "null" => null,
    "int"  => 1,
];
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As you can see, they contain the exact same structure (both keys and values). nothing is different. So it should be equal. but... it's not.

echo json_encode($object1 === $object2);
// -> false
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I thought maybe i'm wrong, and JSON is not an StdClass. so I usedvar_dump and still, they are the same:

object(stdClass)#1 (2) {
  ["null"]=>
  NULL
  ["int"]=>
  int(1)
}

object(stdClass)#2 (2) {
  ["null"]=>
  NULL
  ["int"]=>
  int(1)
}
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Now I'm frustrated and I don't know how to compare two objects, and detect changes between them.

Is it possible?

Edit:

I thought it might work if I'll change$object1 fromJSON to StdClass, like the second one:

$object1 = (object)[
    "null" => null,
    "int"  => 1,
];
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But still...false.

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