OK, if i got you right, you want that in the homepage you’ll have your homepage posts, and in another page you wanna load a different category of posts.
I would create additional page template.
go into your theme duplicate your page.php then rename it to
for example: page-posts2.php
then edit the page-posts2.php and put this code at the top:
Template Name: Posts2
Now login to the admin panel and go to Pages,
You should see in the right under Page Attributes –
Templates – Default template..
If you’ll change it to Posts2 you will be able define the page-posts2.php as you like…