Whilst working on CPP I picked up that not all block headings and introduction paragraphs are consistant accross blocks.

XL

heading - 1.875rem/1.2rem

Introduction pararagraph - 1.125rem/1.6rem

L

heading - 1.75rem/1.2rem

Introduction pararagraph - 1rem/1.6rem

M/S

heading - 1.375rem/1.2rem

Introduction pararagraph - 1rem/1.6rem