Just to be sure I'm understanding the situation-
Phone 1
Phone 2
Phone 1 has Car A but not Car B
Phone 2 has Car B but not Car A
And you're wanting Phone 1 to have Car A AND B data, correct?
If this is the case, then yes, you can simply export via CSV and import to the device you want to combine your records on. Just ensure not to purge any records upon import (aCar will ask you). Also be sure the vehicles have different names (I'm sure that goes without saying).
__________________
|