The problem is that military specifications for ammunition pressure use a different protocol than does SAAMI. Also, a lot of military specification sheets read "PSI" for pressure when in fact they are spec'ing CUP units. Nominally, 7.62 NATO ammunition pressure limits are lower than .308 Win but the allowable variations under the pressure testing protocols are such that the specs are close to the same. So its hard to compare 7.62x51 NATO specifications with .308 Win. In reality, most .308 Win is within 7.62 NATO specs. So I think that its not an unfair simplification to say that they are the same. That said, I'd be careful of using .308 Win commercial ammo in an M14/M1A rifle as if the pressure curve is late with slower powders, not unlike the problem with Garand's, you can have op rod damage over time.

5.56mm ammo is spec'd for a longer chamber leade than .223 Remington SAAMI ammo so I'd pay more attention to a 5.56mm/.223 question and be cautious about using 5.56mm military ammo in a commercial .223 Remington chambered rifle.