Custom Archive Template for Multiple Categories

The simplest way I can think of would be to have the two categories you want to display together grouped under a parent category.

Parent Category
|----Child Category A
|----Child Category B

The file category-parent-category.php would by default show posts from both.
The file category-child-category-a.php would only show from a.
The file category-child-category-b.php would only show from b.
The file category.php would show from all categories.

Would that do what you want?

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