How to assign php file(template) to several pages with same prefix page name/slug

How about this?

For PHP 8 (faster)

if ( str_contains( get_post_field( 'post_name' ), 'activity') ) { 
    get_template_part( 'activity' );
}

For older versions of PHP

if ( strpos(get_post_field( 'post_name' ), 'activity') !== false ) { 
    get_template_part( 'activity' );
}

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