How to use both HTML2PDF and FPDF in a multipage PDF document

I am trying to create a PDF document that is about 12 pages long. This document includes images as well as information from the database that will need to be pulled through. I am using various scripts from fpdf.org. I would like to use both HTML2pdf.php and fpdf.php to allow me to do multiple functions in one document. I started the document with a class in fpdf called class PDF_CircularText. Can I add a second class for html2pdf halfway through the code when I need it?

This is how I started the document and it works great, but now I want to add an extra class for PDF_HTML(); but still keep PDF_CircularText();

require('fpdf.php');

$pdf = new PDF_CircularText();

$pdf->AddFont('kids','','kids.php');
$pdf->AddFont('BENETOpti-Black','','BENETOpti-Black.php');

$pdf->AddPage();
$pdf ->Image('images/background.png',0, 0, 210, 0, 'PNG');