Changing crank arm spindle from different bikes

Looking for a little help. I have an extra S-Works crank arm and spindle (BB 30), my wife has a Quintana Roo CD.01 (BB 30) with a Vision FSA crank. I have to change the bearings in her BB, I am wanting to install the S-Works Crank arm and Spindle if it will work.

Yes, if they’re both pure BB30, then it should work.

The one thing to look out for is crank arm length, if those aren’t the same. It’s not a problem for installation, just rider fit if your wife is used to one length, and your crank is a different length.

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Thanks, they are the same length.