In a skillet over medium heat, melt 2 Tbsp butter. Add panko, lemon zest, ½ tsp Old Bay, salt, smoked paprika, and cook until golden, 3–4 mins. Transfer to a bowl.
Melt 6 Tbsp butter in the same skillet. Add shallots and garlic, cook until softened, 2 mins. (Optional) Pour in wine, cook until nearly evaporated, 1 min.
Stir in corn, crab, and remaining Old Bay. Cook until heated, 3–5 mins. Off heat, stir in lemon juice.
Bring water to a boil, season with salt, cook linguine until al dente, 8–10 mins. Reserve ½ cup cooking water, drain pasta, return to pot.
Add crab-corn mixture and reserved pasta water; toss. Divide among bowls, sprinkle with panko topping and parsley, serve with lemon wedges.