Pooling already extracted dna?
If it were me...


You can resuspend the two separate pellets (A and B) in 10ul each.
Collate in one tube (add A to B).  
Use the remaining 10ul  from your desired volume to 'wash out' tube B and add the wash to tube A.


So long as the DNA is from the same sample this is a perfectly reasonable step that should not result in a substantial loss.