Is the 2014 Atomic Breath the same as the Showa era Atomic Breath?

Gman, your reasoning is a bit flawed. Yes, they feed on radiation. But I could kill you by forcing you to drink too much water. Or by giving you pure oxygen. Second, the dangerous-radiation aspect is only part of it. The heat from it is likely doing plenty of damage. If I served you a hamburger that was on fire and made you eat it, it would hurt. Their body, and yours, cannot repair the damage quickly enough for it to be a net-gain.

Holy crap have i missed out. XD

Anyway as regards to the atomic breath, i really don't see any difference between each incarnation. Sure they made it into a ray effect but the power in my opinion is still the same. Don't know why, just every atomic breath scene has done some major damage to oppents and even killed them.

They're different in regards to how they effect the environment and the targets. The Showa weapon melted things. There was no real 'push' with it. Go to Heisei and the beam has apparently lost the majority of the heat associated with it, and it works like some kind of long-ranged punch, just pushing the enemy back. Legendary Goji, however, literally cooked the FeMUTO alive.

@THEGMAN123 A bit of a late reply, but, first of all, you seem to be the only one arguing about whether his Atomic Breath is plasma or not... it has literally no relevance to anything I've been talking about.

Anyways, film novelizations are adaptations, not supplementary materials that give you more information about the film universe; they are different versions of the film's story, just as the film Tangled is a different version of the fairy tale of Rapunzel. We can't say that the prince in the original fairy tale is in fact a thief named Flynn just because he is in Tangled, and we can't say that Godzilla's Atomic Breath works a certain way in the film just because it does in the novelization, because those are things that were completely made up by the people/person making the adaptation. So far, you've failed to ever address what I've been saying about how the red pulse released from the Mutos' claws just happens to produce a shockwave (which would be a very useful ability for adding some extra punch to their attacks) in addition to an EMP, and that it's very possible that the EMP is merely an unfortunate (for mankind) side effect of whatever internal process of theirs powers this shockwave.

Besides, if this "electric sac" system from the book ever is introduced into the film canon, it's quite likely that not being impaired by an EMP will only mean that his Atomic Breath will have less of a charge-up time, not that it will become an overpowered one-hit kill move like it has been in some previous films; after all, the monsters of the Legendary-verse seem to be meant to interact like real-world animals (i.e. Godzillas and Mutos are like lions and hyenas), and you don't really see any predators that can just up and insta-kill anything that dares to challenge them, do you?