Difference between Reference Guides of BD+C and ID+C

Dear All,

We are working on a Campus project comprising of a BD+C building and ID+C building (v.4). Right now, we're using the reference guide of BD+C for all buildings that we are working on, even for the ID+C project. I'm thinking about buying the ID+C reference guide but is it worth buying it?

Anyone has both references and please give your advice.

Best regards,