Actually all the campagnolo BBs are iso, the problem is the length of them. Chorus and Record uses a 102 BB and the one u need is 111mm if im not mistaken. The spider arms may be set differently than in the High end stuff and that's why u need a longer axle.

Now, the shimano axle might work, again... it might work fine. It is not the ideal situation but it might work ok? (some people might say that it does not work, yes it might work fine), now i'll xplain why. The differences in the tapper are so minimal that sometimes u can get away with it, but the crank might set in the wrong position and u might start having problems with the chainline. Critical? maybe not because will be off maybe a few millimeters only..

What i would do is to check out the length of that shimano bb and do a test. U have to check it out.

Sometimes an axle looks way longer than other ones in numbers but is not that much sometimes... for example from 118 to 111 are 6 millimiters of difference, 6/2 = 3.. it means that u are off only 3 milimeters in both sides... thats not that much. (please do not think in track bikes, because the situation changes and 3 mms is a big difference)

I say test it, if it works fine great u save your self 50 bucks!.