Courgette/pumpkin conundrum

I'm a second-year allotmenteer and I've got a query about the pumpkins I'm growing. 

I got some Hallowe'en pumpkins - an F1 hybrid, can't remember the exact variety -  to grow from T&M and when they fruited I was very proud and they're very definitely pumpkin shaped.  However, they're still green and stripey!  A friend of mine took some thinking they were round courgettes and cooked and ate them as if they were.  Normally I'd ignore this, but her mother who ate them is a botanist by trade!

So after about a month the size is coming along nicely, but they're still green and stripey with no sign of going orange.

So what could they be? Pumpkin or courgette?  I will say that the pumpkins are in the same 3m raised bed as the courgettes and I wondered if they could've cross-pollinated?

I'll try and take some pics and upload them tomorrow for you experts here to look at.  The thing is, if they ARE round courgettes then that means we've got about 8 courgette plants in total! Eeeek!

Thanks for pointing me to that thread.  Much appreciated.  Mine don't look like that one - they're a dark green, possibly a little darker than the courgettes.

I'll take some photos and post them so everyone can see.  I'm going up to the plot tomorrow.

I've just cracked into a huge, freshly picked Boston Squash (due to surprise guests for a Sunday Roast).

Texture and flavour wise, it's just like a big courgette.

I've cut it into eight long wedges and then scooped out the slightly seedy pithy centre as half moons which I'm roasting separately around the chickens.

I might even be able to pass them off as a different veg (they look great).

My point is that I have a feeling that there's not a lot of difference between winter and summer squash until they've been ripened on the vine and cured.