Most likely won't be possible, I don't use IPB but I assume (and also hope) that they don't store passwords in plain text.
You need the plain text password in order to insert them into vBulletin. If IPB uses hashing you won't be able to 'unhash' them easily (if at all). SPF must have used encryption (2-way unlike hashing which is 1-way) or just stored the password in plain text, so it could be used by vBulletin.
Put basically... it is not possible.
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