PDF Invoice Title

If we are having PDF standard format invoice shared with our customer (B2B) and XML inbound response, then can we keep the document title in the PDF invoice to be called as “TAX INVOICE” (or) “COMMERCIAL INVOICE” ? because will this be considered as two different Tax Invoice or it is acceptable because XML is not human readable, hence PDF document can be called as Tax Invoice ?

Invoice Title should be “Tax Invoice” or “Simplified Tax Invoice” in Arabic.