Need help with front Axel question

So my u-joint is going out on my 2012 dodge 3500 longhorn edition.

My question is:
Can I take the entire front Axel out of my 2006 dodge 2500. And put in my 2012??
Or are they different spline count, or length eat.

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I know they take a different universal the 2012's have a bigger one. I'm not sure tho about lengths an splin counts.

Why do you want to swap an axle because of a u-joint? Am I missing something?