Is it possible to put a 268 p/c on a J-red 625 II or would i just be asking for trouble. I have a pristine 268 and a 266 p/c. I was just wondering if it would be a matter of swapping parts or would I be better of getting a 670 p/c. The reason for my question is I have seen the cylinders sold/listed as 670 or 268 replacements on some used parts web sites.