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When you slice a bell pepper in half it will look exactly like any spicy chile pepper. There is a placenta covered with seeds, there are veins running along the flesh of the bell pepper. They are pretty much identical with the main exception being the difference in size. Bell peppers have a fruity scent, just like many hot chilies. Both have a crispness to their flesh and also high water content. You can slice, sauté, grill, char, pickle, stuff, or eat bell peppers just like you would any kind of spicy chilies. But when it comes to bell peppers you'll never have to wear gloves to protect your skin from a chili burn, and you'll never have to reach for a drink to calm the fiery heat after eating bell peppers. 

Yes, it will change the overall texture and appearance of your final dish or sauce. But, when it comes to heat and flavor profile, red pepper flakes are the closest to Hungarian or spicy paprika.

I highly advise that you gradually add the powdered or crushed red pepper flakes to your recipe. Start with one-third of a teaspoon for every teaspoon of paprika. Give it a taste to check the heat and spiciness, and add more when needed.