Hey there! Yes, i do think the 1st one is this hybrid. And yes, the peristome is the border of the pitcher, bellow the lid. This part is very characteristic of ventricosa and ventricosa hybrids, since they use to have a very beautiful red and curved peristome. But when the plant is immature, or has very few pitchers, or it is going thru an acclimatization process the peristome and the whole pricher can be not as showy as they use to be.
I think it is the ventrata hybrid, because ventrata have a fat botom, and then a narrow top. In the other hand, the ventricosa has a fat bottom and a fat top, and in the middle of the pitcher has a narrow waist. Also, the red coloration and the lack of wings tells me it is a ventrata. At least this is my humble opinion
About the sanguinea, believe me they are immature pitchers, but once the plant starts to produce more mature pitchers you will see a difference. Then you will have the chance to see if those pitchers start to become otrange or not thru the whole pitcher. Common sanguinea uses to have some orange coloration in the top of the pitcher, but these orange variety is orange thru the whole picher. But as i told you, you will ned to wait a little to see this.
About the way the immature pitchers look, believe me they are a little different than mature pitchers. Most of the Nepenthes porduce strange, green pitchers when they are immature. I can tell you that i had that problem with some ventricosa plants i bought last winter. They were small plants and they had very strange looking, green, small pitchers that have different forms. They all looked like they were all of different species. But now that they are more mature, they all have the same red, narrow-waisted pitchers
I hope you post pics of your Nepenthes in the future, so we all can see the development of your plants
Cheers,
Jorge Joel...
Emilia's Garden