I know that the standard barrel is 0.6 longer, is that the only difference?

The Centurion's slide is slighly shorter as well.  I don't have a pic of one, but if you look at the front end of the slide, you can tell.  Use the frame for reference if you can find 2 good pics.  There might be a couple you can use in the pic thread up top...

ETA:  Forgot to answer your question...  The barrel will prolly work, but it will stick out pretty far because of above said reason.  I don't think I would try it myself, but your not me and I'm not you...

I am looking for an extended barrel for my Centurion to be threaded and thought this would be an easy solution  if the only difference in the barrel was the length.

D

It will work fine.  

Hey, dtarbox, I liked the way the Trident sounded on your Centurion. I guess I'm gonna have to find the pennies to get that other Centurion in the shop. Damn, you guys are gonna break me.