They’re essentially the same cigarette; with regards to the description, the "Red Label" just replaced the term "Medium". And when it comes to content, "Red" has tar volume of 10mg and nicotine volume of 0.8mg, while the Red Label has tar volume of 7mg and nicotine volume of 0.5mg.
But it will still differ from country to country. Generally speaking, the nicotine content in many cigarette brands is around 1/10 the amount of tar (e.g.: if a brand contains 1mg tar, its nicotine content tends to be 0.1mg).
Find out how much nicotine is in your cigarette at Sayonarasmoking.com.
Nicotine withdrawal is a short phase overall, but it can be intense.
Empower yourself with knowledge about what to expect as you go through the early days of smoking cessation and you'll find it manageable at Verywell.com.