Is document conversion necessary for FSSC 22000 from NSF/ANSI 173?

Hello everyone, 

I currently have NSF/ANSI 173(GMP) certification and recently started working on FSSC 22000 for Dietary Supplement company, we make (vitamins/minerals) semi-raw materials and sell it in bulk 25kg packaging, we do not make finished product. Everything is in powder form.

My question is: After I completed a quick GAP analysis, I see that I have a lot of documents that over lap with the requirements for the 22000 from NSF 173, HACCP, Validations/Verification , change control, etc...I have 200+ active documents (Manuals, SOPs, Checklists , logs....) I understand that (and please correct me if am wrong) the OPRPs are what SOPs are but the layout is slightly different. 

Would it be acceptable if I keep everything in the same format as i already have for NSF 173 templates or do I need a second set of documents for FSSC 22000? which means everything will be doubled and it won't be very time efficient or productive approach.

My document numbering will reflect which documents are for NSF 173, which ones are for FSSC 22000 and which ones are both, or something along those lines but other than that I want to keep all of my documents under the same formatting and style, is that okay? Some will be SOPs and some will be OPRPs, PRPs, etc....

Thank you all for your time.

Sincerely, 

John CT