ureech,
или так ...
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0/js/bootstrap.js"></script>
<script>
$(function() {
let html = $('.modal-body').html();
$('#exampleModal').on('hidden.bs.modal', function (event) {
$('.modal-body').html(html);
})
$('[data-content]').on('click', function () {
$('.modal-body').html(this.dataset.content);
})
});
</script>
</head>
<body>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
Запустить модальное окно
</button>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
...content
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal" data-content="12345" >
Запустить модальное окно 12345
</button>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal" data-content="00000" >
Запустить модальное окно 00000
</button>
</body>
</html>