Go for it! They'll grow! What's cool about potatoes is they are basically clones when planted from tubers. So you can expect to harvest potatoes similar to what you plant even if they are store bought hybrids of some sort. Size may vary depending on growth, but otherwise they'll be what you expect.
I grew pumpkins in the same area as my butternut last year. Any other winter squash would work just the same. The vines crossed each other and all, but at harvest time all the vines were cutting pulled and cut so it didn't matter. We leave them on the vine until harvest. If the vines die back and dry, the squash and pumpkins simply begin to cure before we pick them which is a good thing in my book. Tall sunflowers work instead of corn for height and you can eat them later. Jerusalem artichokes would also work, just know that they have an invasive tendency because any tubers left in the ground may sprout and grow the next year.
For a few years, I've planted potatoes next to squash. Well, maybe 3-4 feet between the beds, and probably 6-8 feet from a potato plant to the squash hill. I like having them there, as it's a big flat area and I can let the vines sprawl, and dig the potatoes without messing up a raised bed (my RBs are just mounded). I also liked having the squash where they were, as there are some huge boulders about 8-12" down. The squash can grow there, but not root crops.
Why did it say they shouldn't be planted next to each other? Is there a reason in what you read for that statement?
"Raspberry, tomato, cucumber, squash and pumpkin are more susceptible to developing blight if planted with potatoes. Carrots, asparagus, fennel, turnip, onions and sunflowers can stunt the growth and development of potato tubers."
Getting things done I see! Good work.
