although no expert in Nepenthes identification at all I also think it is closely related to the N. bongso - N. ovata - N. singalana group. Identification at this very young stage of growth is almost impossible from my point of view. The seed is wild collected, so it may also very well be a hybrid, which won't make it easier to identify.
The peristome of Tony's and Rob's plants are quite different in shape. Judging from the pictures of adult plants, I would guess Rob's plant is even more likely a N. ovata than Tony's plant - Which I also expect being labeled correct of course!
Sadly very few pictures of different clones of these very variable Sumatran species are accessible. The book of Clarke is great for sure and I really love it. Sadly he only shows one single lower pitcher of most species. From my point of view the pitchers shown are the most impressive ones he found. I believe not all of them reflect the typical appearance of a species well. I.e. some of the N. singalana clones being available over here show virtually no similarity to the picture of N. singalana in Clarke's book.