import foreign private keys within openssh

[Alfredo_4]

I generated a couple of keys with SecureCRT (Vandyke) ssh client.
With openssh (2.9 on HP-UX) I am able to import the public key (ssh-keygen -X -f ) and then I can put it in the authorized_keys2 as I can connect with the SecureCRT client.
By now it runs.

The problem is when I want to connect to this server, with another client (the ssh client from openssh); and so I would like to import the private key to be used as an identity for the ssh connection.
It seems not possible to import the private key generated with SecureCRT in openssh.
I posted a question to Vandyke support that answered they don't know how to do it, and suggested to post a message in newsgroups... fantastic!

Anyone knows how to do it?

Tanks in advance,
Alfredo.