Ah I see..
you can provide the have_rows()
function with a second parameter which is your portfolio pages ID.
//if 2 is the ID of your portfolio page
<?php if( have_rows('recent_project', 2) ): ?>
<div class="row-full-width mb">
<?php while( have_rows('recent_project', 2) ): the_row();
inside the while loop you no longer need to provide the ID.. just use the fields as normal.