McFarlane Halo 3/Reach/4 figure armor cross-compatibility?

[wavehawk]

Just wondering: I know that McFarlane's Halo Reach figures had armor packs and you can swap out and customize them, but could you use those same armor parts on the older Halo 3 or newer Halo 4 Spartan figures?

I'm considering getting one of the new Halo 4 Spartans but modding him with some bits from my older Halo 3 figures and possibly the Halo Reach stuff (because the MK-IV Spartan armors look cool but the helmets suck). That and I need to toy around with something that doesn't involve hacking Gunpla or Figuarts to pieces for customs that fail.

Any advice?

 

[Judge Faiz]

I don't believe it will work as the scales are different.