Without seeing all the code it is difficult to see if modifying these files would affect other spots of your site.
Your “header-logo.php” file is checking to see if you uploaded a custom logo and setting the values to display the logo, alt tag and description. If you are able to find where you upload your logo you could swap it there (but it would be for all logo uses in your site).
If you want the logo changed only in this specific location, you could simply hard code the image of choice as follows:
<?php // Logo // add slashes in front of next line to comment out original logo // get_template_part( apply_filters( 'kicker_filter_get_template_part', 'templates/header-logo' ) ); ?> <img src="YOUR_LOGO_ADDRESS_HERE" alt="ALT TEXT OF YOUR IMAGE" width="ENTER_DESIRED_WIDTH" height="ENTER_DESIRED_HEIGHT" />
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