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