passion fruit vs passion flower?

What's the difference between these?

I want the one with the pretty flowers we used to have in England that climbed on fences.  

are these the same?

https://www.richters.com/Web_store/web_store.cgi?product=X4441&show=&prodclass=Herb_and_Vegetable_Plants&cart_id=7681424.16104


https://pfaf.org/user/Plant.aspx?LatinName=Passiflora+edulis

There is no difference, some passionflowers have fruit, and some are ornamental (have empty "fruit")

fwiw I have a Frederick
https://www.passionflowervine.com/product/passiflora-edulis-frederick-passion-flower-vine-live-plant-edible/

Lovely plant, large, yummy fruit!

I think you will have an easier time just getting flowers.  I have a vine that produces fruit and beautiful flower.  I got it from a friend.  It was her fourth or fifth attempt at finding a passion fruit that would produce a fruit in zone 7B.  The common name here is "Maypop".  My husband says the fruit is nothing like the passion fruit he grew up with in New Zealand.  Seeds are fairly large and hard.  They reseed amazingly well.  We now call it devil weed!

My Frederick went from 6" to 10' in one season. It has weathered some slight frost fine. I prune it a lot to keep it under control. The flowers are gorgeous and the fruit really tasty. I am in zone 9-10 though...

https://en.wikipedia.org/wiki/Passiflora_edulis

I'm in the UK, and the passionflower I have (and see commonly in stores) is Passiflora Edulis. It does attempt to grow fruit- but they've never grown very large or ripened so I'm not sure what they would become.