Not a chance in Hell that a front wheel axle will have a 10mm diameter thread. What happens is that a 10mm nut will be a loose fit on a 9mm axle and appear to fit, but as soon as you apply any significant torque, you will damage the threads. Also, if the thread pitch is slightly dissimilar such as 1mm vs 26 TPI, then you will be able to thread the nut on initially for a few turns before it begins to bind, after which if you continue to tighten it you will again damage the threads. As to your Bianchi Pista, the hubs are not Italian, so the front axle is most likely 9mm x 1mm, and your Kilo TT rear axle is 10mm x 1mm.
Ref. Southerland's Handbook for Bicycle Mechanics, Third Edition, pages 11-2a and 11-3a.
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Last edited by TejanoTrackie; 02-21-21 at 08:36 PM.