Both pages are sized at A4.
Have you considered opening the PDF in a PDF reader/viewer/editor and print them out to manually fill in?
You could open the PDF up in Word and Word will attempt to convert to a docx format.
It may not turn out as you expect - give it a try. It is a complex document so it will need a lot of post editing.
I can open in Adobe Acrobat and convert it to a usable Word document (attached), but you will need to download it, enable editing, then print the pages out to fill them in. Just as easy to print from the original PDF at your end.