i wanna merge two lavavel projects

I was making a website that has two parts first one is social-media part and the second one is a core-generator part, I made both of them separate laravel projects, Now I wanna merge them as one project, Frist part run on php5 and laravel 5.4 and the second part run on PHP 7 and laravel 5.5

I don`t understand how to do it

via Chebli Mohamed