Are the Airtel prepaid recharge plans for 4G and 5G different

Not really! Airtel generally offers prepaid recharge plans that work for both 4G and 5G. The main difference is that to use 5G, you need to be in an area where Airtel has 5G coverage and have a 5G-enabled phone. Many plans, like the ₹349 plan, now come with "unlimited 5G data" as an extra perk, as long as you have 5G coverage. So, you usually pick a plan based on the data and calls you need, and if 5G is available, you get to enjoy it with that same plan!