Every time I've seen "Complete Works" it's been very different, with set bits, gags and improvisations that do not match up with the previous. I've heard that the authors actually encourage changes within the script, so that the bits that may have worked for their first performances don't become dated over time. I'm not sure where this may be written in the contract or in the script (I don't have it in front of me at the moment), but the wikipedia page for "Complete works" notes:
"The script contains many humorous footnotes on the text that are often not included in the performance. However,improvisation plays an important role and it is normal for the actors to deviate from the script and have spontaneous conversations about the material with each other or the audience. It is also common for them to make references to pop culture or to talk about local people and places in the area where performance is done. As a result, each performance can be vastly different from another, even with the same cast."
In other words, perhaps more than any other play that I've encountered, it's highly unlikely that the publisher or author would object to your changes. (As always, however, study your contract with them in detail, and if they don't provide any kind of blanket amnesty for changes, ask!)
------------------------------
Tim Mooney
timmooneyrep.com
Prospect Heights IL
Original Message:
Sent: 02-21-2016 16:35
From: Michael Johnson
Subject: Omg! The complete works of Wm Shakespeare (abridged)
Try talking with the publisher about your concerns. In some situations, it is possible to cut a play for high school performance-- as in for an adjudicated or festival performance, or for time, in the case of a school tour of scenes or shows.
------------------------------
Michael Johnson
Trinity NC