Yes. By definition.
No.
G3.5 and Newborn Cuties are not the same thing. I'd like to give you the full list of G3.5 animations:
Waiting For The Winter Wishes Festival
Twinkle Wish Adventure
Pinkie Pie's Ferris Wheel Adventure
Sweetie Belle's Gumball House Surprise
(you can probably count Wonderful Winter Song clip, too, even though 95% of it is cut from Twinkle Wish Adventure)
Once Upon A My Little Pony Time: Over Two Rainbows
Once Upon A My Little Pony Time: So Many Different Ways To Play
Only the last two installments are what is known as "Newborn Cuties".
There is a problem with separating G3 and G3.5, because they overlap. They are entirely different things, but they overlap, giving us seven Meet The Ponies shorts and a couple more shorts that were done in G3 artstyle, but with G3.5 characters. Some of those shorts even reference the events of G3, but that's not enough for them to be the same thing.
There are only three G3 characters in the focus of G3.5 that came from G3: Cheerilee, Pinkie Pie and Rainbow Dash. All other core characters were new and never appeared in G3, safe for the aforementioned shorts. Even further, Cheerilee and Rainbow Dash were redesigned, both in appearance and personality. G3.5 Cheerilee in particular has undergone such a drastic change that she's as far from her G3 self as she is from her G4 self. One might argue that she's even closer to G4 than to G3.
Minty, Rarity, Wysteria, Lily Lightly and others are nowhere to be seen in G3.5 proper, except maybe in the background as easter eggs and what not. Toola Roola, Sweetie Belle, Scootaloo and others are nowhere to be seen in G3 proper.
It's a bizarre case, and I'm sure it gets even more bizarre if toys are brought into question.