Where are stored your .kwl and .salt files? In kde5, it's there:
Code:
$ ls .local/share/kwalletd/
kdewallet.kwl kdewallet.salt
I don't know where it was stored in kde4 (I didn't use it then).
If your wallet is not named kdewallet, change the default wallet in System Settings>KDE Wallet>Select default wallet (rough translation from French). In KDE Wallet setting page, also check the box "Activate KDE Wallet sub-system".
If the above doesn't work, please share the error message you get when trying to import your wallet in KDE Wallet Manager.