How are conventional oven and convention oven and microwave oven are the same?

That is what conventional means, yes

A microwave is a form of electromagnetic radiation in the frequency range between 300 MHz (or 0.3 GHz) and 300 GHz. A microwave is also the "shorthand" name we give to a common appliance called a...

You can't. Only if it's a microwave-oven

compare microwave oven to conventional oven

Microwaves radiate the food while air has to heat up food in an oven.