I'm not 100% sure on interchangeability but I've always stuck by the guidelines to run a matched bolt/carrier/barrel extension-- either all DPMS-pattern or all Armalite-pattern.
I do know that when I shipped my 6.5CM GAP10 back because it was frequently piercing primers with the original DPMS bolt & carrier (.080" firing pin) that GAP switched it over from DPMS-pattern bolt/carrier/extension to an Armalite bolt/carrier/extension. Going to the .068" firing pin solved the piercing problem and made a *huge* difference in primer flow/condition at the firing pin impact.
I would like to switch my 6.5CM JP LRP-07 over to a .068" firing pin but I don't want to get rid of the JP bolt or JP Low Mass carrier. I've discussed the advantages of the .068" firing pin in regards to primer condition when running .260/6.5CM with Ben at JP, maybe if we're lucky they'll start making DPMS-pattern bolts but with .068" firing pins...