Help - Merging two projects into one - Interview presentation

I came across this Forum and hoped that Members might be able to help me with ideas and some steer around a presentation I have to put together for a job interview. Essentially, it's a programme management role within an IT environment - I have not led on IT project before. The presentation topic is around merging two projects -  what approach and steps require to be taken. It's a 10 - minute presentation. Do any Members have some nuggets and ideas please? I would be immensely grateful for any help/steer/resource you can give me please. With thanks.