SAFe promotes Communities of Practice (CoP) as groups of people who have a common interest in a specific technical or business domain and actively get together to sharpen up a set of skills.
LeSS promotes Communities of Practice as groups of people who share a concern, a set of problems, or a passion about a topic, and who deepen their knowledge and expertise in this area by interacting on an ongoing basis.
Based on the above, one can then infer that the objective of a CoP is the same between SAFe and LeSS: Make sure knowledge flows in a horizontal (non siloed) way.
Finding reliable links for Spotify model isn't as straightforward (happy to receive suggestions on comment session). In a Google search, the unique entry talking about Chapters (that's not a blog entry like medium or other company-specific entries) is from Atlassian website. The link shows the distinction the model makes between Guild (cross tribes) and Chapter (within tribe).
Now, if one abstracts the differences between the terminology on how people is grouped (teams, trains, squads, tribes), it seems to be the underlying objective of a CoP is the same of a Chapter (or Guild, for completeness). Is there any sound reference that says otherwise? Are there other concrete aspects where CoPs and Chapters (or guilds) cannot be considered different names for the same concept?
ps.: I couldn't find any reference in Nexus framework talking about neither of them.