Pau, what do you think? My gut says we need to have the buttons match pretty precisely if we're sending users instructions via a guided tour.
Using the same exact label would be my preferred option since it causes the less problems (there is no doubt what the text is referring to).
The "beta" part can be understood a as an additional marker (as if it say "new" as Google products used to). It is likely that users can identify this option just by referring to it as "Edit", but considering that there is another "Edit" button next to it, making it obvious may save users some seconds of doubt.
Pau