OK to mix QS Campag Ergo & non-QS front derailleur?

Subject line is self-explanatory; having failed so far to find some 2nd-hand non-QS 10sp levers, I may have to buy the current QS type brand new. But are they suitable for pre-QS front mechs? Some websites claim I need a QS-compatible one but didn't know if this was just to get me to part with more cash in spite of having already splurged 60-plus quid on Veloce ergos. 
Thanks in advance for all advice offered.
David

Thanks in advance for all advice offered.
David
"It is not enough merely to win; others must lose." - Gore Vidal
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I eventually bought the QS front mech. It could be though that I had not set the none QS mech up correctly.
David