The easiest way is to the change the Img url for the Page that needs a Different Logo . The Page id is used to target that particular page logo only .
Place this JS script in the Google Analytics Section in Salient Theme Options Panel
<script type="text/javascript">
jQuery( document ).ready(function() {
setTimeout(function(){
jQuery('.page-id-6385 #logo img').attr('src','http://www.yourdomain.co.za/wp-content/uploads/2018/03/logo-hr-light-tur.png').attr('srcset','http://www.yourdomain.co.za/wp-content/uploads/2018/03/logo-hr-light-tur.png 1x, http://www.yourdomain.co.za/wp-content/uploads/2018/03/logo-hr-light-tur.png 2x');},500);
});
</script>