Accurate Lengths Of IJN ships ?

[Captain_AJ]

I have been looking through prior post about the subject of correct length and heights of IJN Ships .. What I have been using is from a publication of actual sizes of certain classes of Of ships . It appears to be very confusing that the actual historical facts of these ships are not the same in prior post dated back in 2007 . for example the factual length of a Mogami heavy cruiser shows a length 620 , In the prior post it shows 320 , What I am I missing here . any help would be appreciated