Hello and welcome back!!
The biggest change is the amount of carbs allowed. Carbs are now counted as 'net' and on Induction one is allowed 20 net carbs. I would encourage you to download a carb counter such as fatsecret which will allow you to calculate net carbs.
The other change is a cap on protien intake... I know!! The book helps you to calculate your average daily requirement per your height.
I am back at the dreaded OWL again which like you was my downfall the last time round... It has not been easy but im advised to take it as baby steps and maintain a journal so i can monitor progress and impact of food.The weight loss is considerably slowerr this time round.. apart from the initial big drop,possibly cos one is 10 yrs older!!
Also make sure you have plenty of salt... via soya sauce, bullion broth etc to avoid 'Atkins Flu' and cramps etc.
All the best and this time round we have better tools and support so we should make it!!