Reply To: Can i use 2 page content-forum & content-forum-slug on bbpress?

I am very unclear as to what you are trying to achieve.

if you want one forum say forum id 12345 to display differently, then just amend content-single-forum to

<?php
$forum_id = bbp_forum_id() ; 
if $forum_id = '12345' {
?>

<div id="bbpress-forums" class="bbpress-wrapper">

	<?php bbp_breadcrumb(); ?>

	<?php bbp_forum_subscription_link(); ?>

	<?php do_action( 'bbp_template_before_single_forum' ); ?>

	<?php if ( post_password_required() ) : ?>

		<?php bbp_get_template_part( 'form', 'protected' ); ?>

	<?php else : ?>

		<?php bbp_single_forum_description(); ?>

		<?php if ( bbp_has_forums() ) : ?>

			<?php bbp_get_template_part( 'loop', 'forums' ); ?>

		<?php endif; ?>

		<?php if ( ! bbp_is_forum_category() && bbp_has_topics() ) : ?>

			<?php bbp_get_template_part( 'pagination', 'topics'    ); ?>

			<?php bbp_get_template_part( 'loop',       'topics'    ); ?>

			<?php bbp_get_template_part( 'pagination', 'topics'    ); ?>

			<?php bbp_get_template_part( 'form',       'topic'     ); ?>

		<?php elseif ( ! bbp_is_forum_category() ) : ?>

			<?php bbp_get_template_part( 'feedback',   'no-topics' ); ?>

			<?php bbp_get_template_part( 'form',       'topic'     ); ?>

		<?php endif; ?>

	<?php endif; ?>

	<?php do_action( 'bbp_template_after_single_forum' ); ?>

</div>
<?php
}
else {
?>
<div id="bbpress-forums" class="bbpress-wrapper">

	<?php bbp_breadcrumb(); ?>

	<?php bbp_forum_subscription_link(); ?>

	<?php do_action( 'bbp_template_before_single_forum' ); ?>

	<?php if ( post_password_required() ) : ?>

		<?php bbp_get_template_part( 'form', 'protected' ); ?>

	<?php else : ?>

		<?php bbp_single_forum_description(); ?>

		<?php if ( bbp_has_forums() ) : ?>

			<?php bbp_get_template_part( 'loop', 'forums' ); ?>

		<?php endif; ?>

		<?php if ( ! bbp_is_forum_category() && bbp_has_topics() ) : ?>

			<?php bbp_get_template_part( 'pagination', 'topics'    ); ?>

			<?php bbp_get_template_part( 'loop',       'topics'    ); ?>

			<?php bbp_get_template_part( 'pagination', 'topics'    ); ?>

			<?php bbp_get_template_part( 'form',       'topic'     ); ?>

		<?php elseif ( ! bbp_is_forum_category() ) : ?>

			<?php bbp_get_template_part( 'feedback',   'no-topics' ); ?>

			<?php bbp_get_template_part( 'form',       'topic'     ); ?>

		<?php endif; ?>

	<?php endif; ?>

	<?php do_action( 'bbp_template_after_single_forum' ); ?>

</div>
<?php } ?>

and change whichever display you want