It depends. The novel takes some liberties but still captures the broad strokes of the westward expansion.
It's quite close. The novel is based on real events with some artistic enhancements to make it more engaging.
The Story of Minglan is considered a relatively faithful adaptation of the novel. It manages to capture the essence and key moments. Although there may be a few differences to make it more suitable for visual storytelling, it doesn't stray far from the source material.
The closeness varies. Certain aspects are replicated precisely, while others are adapted to fit the medium or add more drama. But the core essence of the comic is mostly retained.
It follows quite closely. There are some differences, but the main plot and character developments are similar.
It follows quite closely. The main plot and key elements are mostly intact.
It follows the manga quite closely. There are a few minor changes, but the main plot and characters are intact.
It follows quite closely. The main plot and key characters are consistent, with only a few minor tweaks for the medium of TV.
It varies. Some aspects are very close, but there are also changes made for the cinematic adaptation to appeal to a wider audience.
It varies. Some storylines are very similar, but there are also significant differences to make it more suitable for TV.
Overall, Riverdale takes inspiration from the comic but makes significant alterations to the plot and characters. Some storylines are unique to the show and not found in the comic at all.