Yes. Yes. Yes and yes.
I know.
It's just my view on mangle.
And the way you put it makes you sou d like you know the entire lore, so why not explain the entire thing with everyones names and other shit matpat is trying to figure out. Yes I know you build robots, but in the Fnaf world anything is possible. From living Zombies to a man getting killed by ghost.
So yeah, what you say is more logical, but what I say is more set in the whole Fnaf lore-ish way.
And I actually do have points why I think that both of these are different heads.
And the fixed model version of mangle can not be exactly correct either.
The second endo head might be from another animatronic to.
And we can actually do further analysis on the lore after security breach is out.
I do try to make most of the lore logical, but I do like to keep my own ideas in there to.
And since your someone to watch gacha Fnaf videos on YouTube, you should know what an 'AU' is.
All I'm saying is I don't think that this is perfect point for me. But it does make a lot of sense in it.

“But then there was The Bite of '87. Yeah. I-It's amazing that the human body can live without the frontal lobe, you know?”
―

“Welcome to Freddy Fazbear's Pizza. A magical place for kids and grown-ups alike, where fantasy and fun come to life. Fazbear Entertainment is not responsible for damage to property or person. Upon discovering that damage or death has occurred, a missing person report will be filed within 90 days, or as soon property and premises have been thoroughly cleaned and bleached, and the carpets have been replaced.”
―

“And what makes you think they won't kill you?'
'Because I am one of them.”
―

“Uh, if they happen to see you after hours probably won't recognize you as a person. They'll p-most likely see you as a metal endoskeleton without its costume on. Now since that's against the rules here at Freddy Fazbear's Pizza, they'll probably try to...forcefully stuff you inside a Freddy Fazbear suit. Um, now, that wouldn't be so bad if the suits themselves weren't filled with crossbeams, wires, and animatronic devices, especially around the facial area. So, you could imagine how having your head forcefully pressed inside one of those could cause a bit of discomfort...and death”
―

“Hello, hello? Hey you're doing great! Most people don’t last this long!”
―

“Remember, these characters hold a special place in the hearts of children and we need to show them a little respect, right?”
―

“One more thing, don't forget the music box. I'll be honest, I never liked that puppet thing... It was always...Thinking...”
―

“Uh, that restaurant should be the safest place on earth.”
―

“And what makes you think they won't kill you?”
―

“He didn't have a natural laugh because he'd never felt real joy.”
―