actually, this was already discussed on tectia website,just try to search it. It is well detailed there. to give you an idea, it is something like:
ssh-keygen-g3 --import-private-key /etc/ssh/key1 /etc/ssh2/key1
ssh-keygen-g3 --import-public-key /etc/ssh/key1.pub /etc/ssh2/key1.pub
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