Photoshop 7

As far as i know, Photoshop CS2 was the first version to let users conform pdfs to PDF/X-3

Photoshop 7 doesn't offer any choices of Standards in the PDF Options dialog

@timo_3523 

Both Photoshop 7 and PDF/X3 were released in the same year, 2002. 

I would guess that it is unlikely, but check this Help page for creating PDFs using PDF Standards to see if it is available:

https://helpx.adobe.com/photoshop/using/saving-pdf-files.html

Jane