You are reading two different but connected documents.
MED B.075 is taken from EU Regulation 1178/2011 (Aircrew Regulation) Annex IV and this simply provides the regulatory framework for medical requirements.
AMC1 MED B.075 is taken from the Acceptable Means of Compliance, which is the document which tells the authority how they achieve compliance with the regulation.
This may seem like unnecessary duplication of effort and there is a lot of legroom in that argument.
Look at Part-FCL; the regulatory framework is in EU 1178/2011, attached to which is the AMC and on top of that you have the CAA's very own CAP 804. Between the three of them they present an absolute minefield of documentary, indecipherable crap which could have been easily combined into one document a fraction of the size of these three put together. The duplication is staggering, navigating them is an absolute nightmare, some essential areas were omitted from the original release and for extra effect, they've even managed to include some contradiction.
Surprised?