JSFiddle - React, Tailwind, and code Playground

HTML

<div id="texte-a">La nuit descend, je pressens</div>

<div id="texte-b">La nuit pressent, je descend</div>

CSS

.yellow {
 background-color:yellow;   
}

JavaScript

$(document).ready(function() {
    var text_a;
    var text_b;

    $('#texte-a').each(function() {
        text_a = $(this).text().split(' ');

        for (var i = 0 in text_a) {
            text_a[i] = '<span class="word">' + text_a[i] + '</span>';
        }
        $(this).html(text_a.join(' '));
    });

    $('#texte-b').each(function() {
        text_b = $(this).text().split(' ');

        for (var i = 0 in text_b) {
            text_b[i] = '<span class="word">' + text_b[i] + '</span>';
        }
        $(this).html(text_b.join(' '));


    });

    check(text_a, text_b);
});

function check(text_a, text_b) {
    for (var i = 0 in text_a) {
        if (text_a[i] != text_b[i]) {
            $('#texte-a span:eq('+i+')').addClass('yellow');
            $('#texte-b span:eq('+i+')').addClass('yellow');
        }
    }
}