WordPress Rest API Create Post

Is it possible to login to my different WP website from another WP website (they have different domain and host) ?

Actually, I am trying to create a post on one of my site from my another site using Rest API?

I don't even know if it is possible?

If it is possible, can anyone please shade some light on this?

I have been trying hard but I am stuck from past few days. All I am getting is 401() error on return.

I can share my codes for further explanation.

class MyPlugin
{

    function __construct()
    {
        add_action( 'wp_ajax_abc_add_post', array( $this, 'abc_add_post' ) );
        add_action( 'wp_ajax_nopriv_abc_add_post', array( $this, 'abc_add_post' ) ); 
        add_action( 'wp_footer', array( $this, 'my_js' ) ); 
    }
function abc_add_post()
{
    $api_response = wp_remote_post( 'https://test.com/wp-json/wp/v2/posts', array(
        'headers' = array(
            'Authorization' = 'Basic ' . base64_encode( 'saurab:saurav123' )
        ),
        'body' = array(
            'title'   = 'My test',
            'status'  = 'draft', // ok, we do not want to publish it immediately
            'content' = 'lalala',
            'categories' = 1, // category ID
            'tags' = '1', // string, comma separated
            'date' = '2018-08-17T10:00:00', // YYYY-MM-DDTHH:MM:SS
            'excerpt' = 'Read this awesome post',
            'password' = '',
            'slug' = 'new-test-post' // part of the URL usually
            // more body params are here:
            // developer.wordpress.org/rest-api/reference/posts/#create-a-post
        )
    ) );

    $body = json_decode( $api_response['body'] );

    // you can always print_r to look what is inside
    print_r($api_response);
    if( wp_remote_retrieve_response_message( $api_response ) === 'Created' ) {
        echo 'The post ' . $body-title-rendered . ' has been created successfully';
    }
    else{
        echo "here";
    }
    die();
}

function my_js()
{
    echo "script
    jQuery( document ).ready( function ( $ ) {
    $( '#my-submit' ).on( 'click', function(e) {
        e.preventDefault();
        var title = 'test'
        var content = 'this is test';
        var status = 'draft';

        var data = {
            title: title,
            content: content
        };

        $.ajax({
            method: 'POST',
            'Accept': 'application/json',
            'Content-Type': 'application/json',
            url: 'https://saurabadhikari.com.np/wp-json/wp/v2/posts/',
            data: data,
            beforeSend: function ( xhr ) {
                xhr.setRequestHeader( 'X-WP-Nonce', WTEAjaxData.nonce );
                xhr.setRequestHeader( 'Authentication', 'Basic ' + btoa( 'saurab:saurav123' ) );
            },
            success : function( response ) {
                alert('yes');
                console.log( response );
            },
            fail : function( response ) {
                alert('no');
                console.log( response );
            }
        });

    });

} );

    /script";
}

}
new MyPlugin;

Thank you.