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Cable pull is not relevant, derailleur shift ratio is. It should work as they both use the same 1.5 derailleur shift ratio. (If you're sure it's 3.0mm, not 3.2mm, that is. If it's 3.2mm it won't work.)
we will refer to the systems as Campy “old” and Campy “new”. Campagnolo changed the shift ratio and cable pull between the two systems. 8-Speed systems are Campy “old.” 9-speed systems come in both varieties. The “new” 9-speed systems were produced after 2001. Most likely you have a newer group, but if you are unsure, old-style controls are absent of graphics or have the groupset name on them and new-style will be printed with “9-speed.” Newer 9-speed derailleurs moved the “B” adjuster screw down by the cage, as opposed to the old-style that places it where Shimano derailleurs typically have it by the frame and mount point. After that its easy, 9/10/11-speed systems are all the same. Just match the number of gears on the cassette with the number of clicks in the lever (minus 1, because 10-speed shifters make only 9 clicks) and you are good to go. The derailleur ratio remains the same across the range.
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frankenbike
Thrust
Cable pull on 9 speed Campy from 2000 is 3.0 whilst 10 speed is 2.8.
Will a 10speed rear derailleur work on 9 speed levers as the it's just a 0.2 difference?
Calling on the power of @mdcc_tester