Thanks you all for the responds.
I just called Sig again and spoke with another rep.
This particular rep seemed to have extensive product knowledge. I was told that the 9mm caliber exchange kit will work flawlessly on a 226 (.22 platform). The 9mm exchange kit will also work on a 226 (.40 platform) assuming its a newer production firearm.
Apparently the older 226 models (.40 cal) tend to have issues with exchange kit therefore sig product description states "for .22 p226 models only".
The rep mentioned that I can try out the kit and if for any reason there any hiccups, I may return the product within 14 days.
Also, if your register your firearm with Sig, a 20% discount will be applied to all purchases.