Theoretically it does work ... but I would caution you strongly. Some of the projects (especially those running older versions of BOINC server software) won't pick up the change ... but you can change those manually with no problem. Also expect problems (although you're not running it -- but for others considering the same thing) at World Community Grid which never seems to play nice with BAM.
However! Have a look at my 60 day charts to see my experience when I tried the same thing not long ago. Because you have a retired project (Anansi) you won't be able to change the e-mail address there. For me this created a split-CPID situation that I was unable to resolve. Anansi kept my old CPID and ALL the other projects assigned a new CPID for me. I was unable to resolve this by using the Sync Retired Projects function at BAM (your mileage may vary) and so I had two detailed stats pages - one for Anansi and a new one showing all the other projects with correct credits BUT WITH
NO PAST HISTORY showing. It was like starting from scratch. And when I logged in and clicked on "My Detailed Stats" the link took me to my old page with only Anansi showing on it. I had to manually find my new page for stats and bookmark it so I was able to get to it.
The only way I was able to bring the two stats pages back together again was to change my e-mail address back again to what it originally was -- the gap in my 60 day charts is the result.
Good Luck!