Depending on what your making, yes. Since oranges and lemons are both citrus fruit they can be swapped aroung to change up tastes in food. But it still depends on whats being cooked because if you...
Lemon zest actually freezes very well, some they it even makes it more potent. There's a couple different routes you can take. First you can freeze the entire lemon and take it ouyt when you need it....