The title can be retrieved in an automation from the page. It has a property called Title that you can use. The mention of wanting this to create a rule is confusing though, because you wouldn't create a match rule at runtime. If you are trying to use the title in a match rule, but it is dynamic, then you can use RegEx to match it, or you can use parts of the title. If it is truly dynamic (i.e. the text is just the customer's name for example), then Title is probably not a good match rule to use.

If the title of the webpage B is changing continuously, try to identify any static text in all the titles. If not, simple go with the URL match rule alone.