Group duplicate manga together from different sites

[DakuTree]

This would be nice if possible, it's just tricky due to chapter format differences between sites.

One example is Ane Naru Mono:

• Batoto lists the latest two chapters as Doujinshi & Extra).
• Kirei Cake lists the same chapters as 15.1 & 15.2.

If we group the chapters, how do we properly tell what is the latest one? It's a tricky issue.