If I have a journey triggered by a custom event, and that journey triggers another journey, is the 2nd journey custom data pulled from the custom event tied to the original journey, or does it come from the user profile…

Ie: customer enrollment welcome triggered by custom event, if preferred customer stay in current journey, if associate send to this journey… Will the associate journey pull data from the original custom event (customer enrollment welcome trigger)? If not, and it pulls from user profile, can I send them to list membership to maintain the custom event information or will it still trigger from the user profile based on the email in the list?