From what I’ve read, those should be separate tickets. I’m wondering if the kiosks will reprint your tickets, or if they’re somehow available online? I’d hate to be charged twice. The CBX website shows:
Foreigner:
Passport
FMM Form (Forma Migratoria Múltiple)
Payment of migratory rights (only if your stay is longer than 7 days)
Boarding pass
CBX ticket