TCPDF - Creating multiple copies of a PDF with slight differences

I am using TCPDF to create PDF's of invoices. We are generating three copies of each page, where each has slight differences from the others. 99% of the page is the same but because the copies are used for different purposes, each copy has a bit of information that is unique to it.

Is there a way in TCPDF to tell it to generate 3 copies of the PDF and then have IF statements in the code to accommodate the differences? Or should I just call TCPDF three times with appropriate code for each copy?

Thanks in advance.