Please find code here :-

First, inherit base layout in custom layout and add xpath fro header class and replace with custom header.

<odoo>
<template id="website.layout_inherit" inherit_id="website.layout" name="Custom Website Layout">
<xpath expr="//div[@class='o_logo']" position="replace">
<div class="o_logo">
<a href="/">
<img src="/your_module/static/src/img/new_logo.png" alt="Your Logo" class="img-fluid"/>
</a>
</div>
</xpath>
</template>
</odoo>

Thanks man!