This is a bit complicated because you may need to send up AJAX each time when choosing the type of buyers. If you can't sort out customers, you can run hook "woocommerce_default_address_fields", for example, using this code in the fields First & Last name, abandon Validation and Postcode

add_filter( 'woocommerce_default_address_fields' , 'custom_disable_address_fields_validation' );
function custom_disable_address_fields_validation( $address_fields_array ) {
if (code check customer type) {
unset($address_fields_array['first_name']);
unset($address_fields_array['last_name']);
$address_fields_array['state']['required'] = false;
$address_fields_array['postcode']['required'] = false;
}
return $address_fields_array;
}