Consolidating Two Disk Databases

I used Ctrl C and Ctrl V to copy projects from one database to another on the same Windows machine. In the destination database when I use the list view in Proj Mgr, I now see that the LAST MODIFIED and the DATE CREATED fields of these projects have changed from their original dates to the date I copied and pasted them into the second database.
I did a backup of the two databases before I did this so I can go back, but how can I move projects from one dB to another while retaining the correct dates. (My objective is to consolidate the two databases into one. Once I have copied the projects from dB A to dB B I was going to go into A and delete them or just delete the entire database.)
Is there a better way to combine my two databases than the way I just tried, which ended up changing the Date Created and Last Modified dates?
I did a backup of the two databases before I did this so I can go back, but how can I move projects from one dB to another while retaining the correct dates. (My objective is to consolidate the two databases into one. Once I have copied the projects from dB A to dB B I was going to go into A and delete them or just delete the entire database.)
Is there a better way to combine my two databases than the way I just tried, which ended up changing the Date Created and Last Modified dates?