How to Update materials in scene with same edited materials from library

[sygboe]

hello,

 

Im trying to create a library of materials which i keep making small tweaks to.

if i have scene with all the same materials applied, how can i get the scene to quickly 'update' to the new tweaks ive made?

it seems to just always be a copy of the same material.

 

all the names are the same.

 

any help appreciated.

do i have to use xref materials?