[stroker]

will a G22 barrel work in a G23 ,other than being longer?

[JR]

Absolutely not. The lugs are entirely different. It will not work and if you manage to get it in your gun you will need an Armorer to get it apart.
LWD offers extended length G23 barrels. See them here (look at the L & XL) http://www.lonewolfdist.com/Search.aspx?TERM=lwd-2340