Which design pattern suitable to fetch same type of data from multiple sources, club them into a single unit and applying multiple filters

I have two products, Product A and Product B. Product A has a list of Campaigns created using M database calls and Product B also has a list of campaigns created by separate N database calls. Some calls are common between M and N. Now, after the creation of a list, we want to apply a list of X Filters on Product A and a list of Y Filters on Product B.

What do you suggest, how should we approach it for the design of the system? Any suggestions or link or reference to guide me in the right direction would be greatly appreciated.