Use existing Task List Page, Task Form Page and Add Mini Task Page

I am developing a Realty app. I need to add a new navigation section as Tasks and Calendar within this app. I also want to utilize the existing Task List Page and Task Form Pages such that if any changes are made in the task pages of the Realty App, they should not be reflected in the native Task List Page and Task Form Page of the Sales App. 

I have created a new Task and Calendar from the Freedom UI Section. This has created new page. However, if I make any changes to the New page or form page, it gets reflected in the existing Task List and Task Form pages of the Sales App. Please guide me on an efficient way to achieve this.