Hello there and welcome to Just Answer. My name is XXXXX XXXXX I will be assisting you today. I am an engineer with over 30 years of electrical and electronic training, repair and installation experience. I will try and answer your question accurately and precisely so that we can get you on your way.
It is likely that you do have 220V to both the old range and old oven but we should be sure.
Do you have a voltmeter? If so, measure the voltage across the two hot wires at the box (careful now...).
If not, your electrical panel may have a list of what the breakers are feeding. 220V breakers will be 'two pole' which are double the width (height) of a regular singe pole breaker.
If your range and oven breakers are two pole, then you have 220V at the wall box.
You should compare the breaker amperages - written on the actual breaker trip handle with the requirements of your new oven. If the oven requires a higher amperage than what you have, you may need to rewire that circuit and provide a larger amperage breaker.
I'll be here if you need further help with this issue. Please let me know.