Pearson have a really useful page with links to all the important Reformed Functional Skills (FS) documents.
Scroll to the bottom of the page to find my favourites: two in-house content mapping documents where the new FS maths and English content is mapped to the old content AND to the Pearson Edexcel GCSE (9-1) Maths or English Specification.
The mapping documents are colour coded so you can quickly see brand new content and also content that has moved down from a previously higher level.