BuddyPress.org

have a look here: https://codex.buddypress.org/developer-docs/conditional-template-tags/

there’s some examples as well.

so you could do something like this:

if( bp_is_blog_page() ) {

include( 'blog-header.php' ); // include this file on blog pages

} elseif( bp_is_directory() ) {

include( 'dir-header.php' ); // include that file on directory pages

} else {

get_header(); // otherwise use our normal header

}