Jep p or NACO Charts?

In article ,
(Paul Tomblin) wrote:

In a previous article, Roy Smith said:
[Howie Keefe Airchart Systems]
If I understand it correctly, you get a new SIAP book once a year, and
every 2 weeks get a cumulative list of updates to that book. What
happens if halfway through the year, your book is so beat up that you
need to buy a new one? The updates sheet you're getting is now relative
to an issue of the book other than the one you're using. How does that
work out?

Well, if the update says "change the MDA to 2450" and the MDA is already
2450, then you don't need to do the update, do you?

Is that how the updates work? If they're all like that, then it's
obvious it should not be an issue. But are there things like "procedure
redesigned, get new plate". With something like that, I would have no
way of knowing if the plate I was looking at was the old or the new
version. Or in a case like that, would it say "version xxxxx obsolete,
replaced by version yyyyy" and I'd just have to verify I had the right
version plate?