Hello,
This is because the two companies have different Report Selection - Purchase setup; the company showing report 405 – Order is configured to use that report for Purchase Orders, while the other is using 1322 – Standard Purchase - Order. In the affected company, search Report Selection - Purchase, set Usage = Order, and change the Report ID from 405 to 1322; then go to Report Layouts (or Report Layout Selection), find report 1322 and set your required Word layout as the default. Report selections and layouts are company-specific, which explains why companies in the same environment can behave differently. If your customized Word layout exists only in the other company, export/import or recreate that layout in the affected company first.
Regards,
Oussama Sabbouh