it's always tough with the second. if you dont need tonal flexibility, or functional flexibility like a piezo, just get a duplicate of your CE so that you have a spare.
however, if you're looking broaden your sonic or functional spectrum, try to find something that does not force you to have to drastically change amp and/or pedal settings when you swap in your guitar. if possible, bring your CE and amp when you audition backups, and try to play at gig volumes.
getting a second/third/fourth/etc. prs is a fantastic journey that knows know destination. it took me a long time to find the perfect combination for me and the music styles of the band, which was a dgt and a cu24 piezo. happy hunting!