Yes. Swap freely within the same category: protein for protein, fruit for fruit, carb for carb. The plan works on calories and macros, not magic ingredients.
Swaps that work:
Eggs: tofu scramble or Greek yogurt
Cottage cheese: Greek yogurt, feta or goat cheese
Hummus: avocado
Chia: flaxseed
Fish: chicken, turkey, or canned tuna
Honey: keep it, or swap for fruit
Cooking fat: butter, ghee, tallow or olive oil. Never seed oils.
To swap a whole meal in the app, tap the swap icon next to it and pick an alternative.