You can verify that by creating a workflow something like below logic:
1) fetch all the recipients of delivery#1
2) Use enrichment activity and do reconciliation using recipient delivery logs. Keep join condition as email address. This will give you recipient delivery logs of email addresses targeted in delivery#1. It will give you all the deliveries those recipients are targeted.
3) Based on your target group you can perform your next action.
Use delivery code of Delivery #1 and use that to get all the details you required from that delivery and use this in next one. So it will be like one query to fetch delivery # 1 details and then enrichment to pass required details and then use it as you like.