That depends on what 5.45 you buy. The Russian import ammo such as Wolf, Brown Bear, Silver Bear, & Golden Tiger is equal in power as most of the 5.45 out today. But doesn't have the quality round to round as the US made ammo does. The one exception is the Hornady steel case 5.45x39 ammo but you will pay extra for this ammo.
But if you get into the surplus stuff you can pick & choose the ammo for what you want it to do.
Read this on the 5.45x39mm ammo, especially the parts "Wounding effects"& "Enhanced penetration". Most of the ammo out on the market now is the 7N6 bullet.