USB drive encrypted w/FileVault2 on MBA can't be read on MBP

I encrypted an external USB drive on my Macbook Air that had existing data using the internal encryption, and that works fine. I can unmount and remount, and it requires the password as expected. However, it won't mount on my Macbook Pro, even though they are at the same OS level, 10.8.2. When I mount the drive on my MBP, it won't accept the password.
Any ideas of what the issue might be?
Thanks.

Output of MBA.
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            120.5 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *250.1 GB   disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:                  Apple_HFS MacAir Time Machine     120.7 GB   disk1s2
   3:                  Apple_HFS EMC MacAir SuperDuper   80.4 GB    disk1s3
   4:          Apple_CoreStorage                         19.0 GB    disk1s4
   5:                 Apple_Boot Boot OS X               134.2 MB   disk1s5
   6:                  Apple_HFS NewMacAir               29.4 GB    disk1s6
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Test Partition         *18.7 GB    disk2
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 437078AB-823F-4380-8A85-2BEAF6FCF376
    =========================================================
    Name:         Test Partition
    Size:         19026534400 B (19.0 GB)
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 3F050C46-8D59-4CFD-A8D2-98B49F080F1A
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s4
    |   Status:   Online
    |   Size:     19026534400 B (19.0 GB)
    |
    +-> Logical Volume Family B8003C1B-354A-4C61-B098-F1DEA1156666
        Encryption Status:       Unlocked
        Encryption Type:         AES-XTS
        Conversion Status:       Complete
        Conversion Direction:    -none-
        Has Encrypted Extents:   Yes
        Fully Secure:            Yes
        Passphrase Required:     Yes
        |
        +-> Logical Volume 53F6A26F-E202-4A9E-B17D-1B6509BE6708
            Disk:               disk2
            Status:             Online
            Size (Total):       18707759104 B (18.7 GB)
            Size (Converted):   -none-
            Revertible:         No
            LV Name:            Test Partition
            Volume Name:        Test Partition
            Content Hint:       Apple_HFS

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