And I was referring to neither directly. Diaper-usage is just the end-product of what I was discussing; infantilist regressionism, which I had distinguished from infantilistic fetishism.
It's even a mistake to say my infantilism is a fetish, let alone any conceptions of gender identity.
I see infantilism as a spectrum much akin to a sort of Benjamin scale but translated in severity-of-infantilism terms which runs from paedophilic predation (most actual hypermales) to infantilistic fetishism (most well-adjusted people with the predicament besides) and then, infantilistic regressionism, in which psycho-chronological inversion is achieved. Unlike the somewhat more linear relationship between autism and gender dysphoria severity, there is an inverse-parabolic curve: most paedos are autistic, most age-regressivists, too, are autistic. Both have a poor ToM development at core.
The difference really is one of sexual activity vs. passivity, and how each respectively lends to the development of their associated predicament, one tending towards predicamental-externalisation, one tending towards predicamental-internalization, ergo, myself in the latter case (I speculate however there's a rare subtype encompassing both ends of that extreme in shoehorn effect, but I won't delve into detail lest I'm so-accused).