1- Sakura is stronger than before?
Yes, it's a manga proof, she has gotten stronger (literally, and generally), deal with it the way you want, but it's a fact, a blind monkey would see it!! She has a big reserve of chakra, she can hit even stronger, and can summon Katsuyu, so far... but I am pretty sure she will show us her self-regeneration skill soon.
2-Sakura has the same level of Naruto and Sasuke??
Highly debatable, I think she hasn't the same offensive level, or the same chance to win a direct battle with a S rank shinobi, as Naruto and Sasuke have. But she has some support abilities that neither of them has, like Katsuyu massive healing skills, she is not as strong as them, but has some moves that make her more useful than them in some circumstances. What i believe she meant on the manga, is that she can battle without being protected all the time now.