Need a nepenthes id

[MadAboutCPs]

I need these Nepenthes pitchers ID'd. Let me know what you think. Each photo was taken from different Neps and purchased from the same source.
Attached were name tags labelled as N.khasiana. I believe them to be N.khasiana but after looking on the web I have noticed one with a more than prominent wing and am rather sceptical now. Are there variations in this species?

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thanks,
C

 

[nepenthes gracilis]

Moving to ID forum. BTW looks like it could be N. khasiana.