Are these really sweet peas?
Hi my first time growing sweet peas this year. Picked up 2 sets of plugs from the garden centre in March and planted them out, where they've been doing well. Now they've grown, onee set of plugs is definitely sweet pea, but one looks totally different, has pure white flowers that quickly go to seed that look like mangetout. I wonder if they were mistakenly labelled?
I've been pulling these off as they appear. On the one hand I don't want to waste these if they are not sweet pea and are in fact edible. On the other hand the last thing I want is to eat a glut of them and end up with health issues if they are indeed sweet pea. Any advice appreciated.
Here are the ones I think may not be sweet pea. How can I positively identify what they are:


this is the other set of plugs. They've been growing more slowly and have yet to flower. The stems are flatter. I think these are definitely sweet pea. 
I've been pulling these off as they appear. On the one hand I don't want to waste these if they are not sweet pea and are in fact edible. On the other hand the last thing I want is to eat a glut of them and end up with health issues if they are indeed sweet pea. Any advice appreciated.
Here are the ones I think may not be sweet pea. How can I positively identify what they are:




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Sweet Peas are poisonous.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Not sweet peas -the flowers don't grow like that on sweet peas, and the pods are different, as @Uff says.
I wouldn't eat them though, just to be safe. Perhaps worth notifying the GC you got them from.
I live in west central Scotland - not where that photo is...