Hi Mel,
The answer to yr query likely depends on yr specific choice of matrix. My opinions are summarised below. Yr local experiences may differ(?).
IMEX, auditors have not been particularly concerned over the age of a reference for a risk matrix or its exact risk pattern as long as –
(a) the reference is not truly “antique” (cf NACMCF is 1997!) or attributed to some “obscure-looking” source. These are subjective terms of course.
(b) the general design/implementation looks internally consistent based on the auditor’s own routine experience/guidance. Basically the matrix should not be visibly, significantly, atypical. "Typical" has some further theoretical implications but such are rarely considered in routine food haccp texts.
(c) the haccp conclusions/actions derived from the matrix are (i) compatible with previous auditor experiences/guidance for hazards commonly encountered elsewhere and (ii) seem “not unreasonable” for other hazards.
Recently I have used matrices whose "action" portion matches the format shown on pages 69, 72 in the (then) "official" 2004 file attached. (and also one of the options [Pg23] in the mat5 file/my previous Post). Matrix theorists do suggest certain features regarding desirable formats but it seems those used in practice are mainly based on experience. The preferred choice may also relate to the specific risk assessment methodology used in the hazard analysis which can vary between users.
The haccp literature demonstrates that a substantial variety of matrix sizes and formats are in common use.
Two refs as per above are probably better than one. 
So you may need to do a little research around yr chosen matrix format if you specifically seek an "official", "recent", food reference. If "recent" is not mandatory, life may be easier. Or you may get lucky.
Risk Matrix, Guidance for Risk Managers,2004.pdf 683.37KB
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