"Display Template" mode?

I was wondering if there was an easier way than memorizing pixel counts to replicate a layout but with different inputs like different camera shots being the variable that changes not the layout itself.

Like how do I replace camera one in one scene selection with camera 4 in another scenes selection and use the exact same layouts without duplicating the layouts and the physical cameras associated with them?

Is the only method of doing that is to replicate pixel counts?

I need exact pixel counts so that the left eye and the right eye can lay over each other in a stereoscopic anaglygh and be correct in a side by side half mode.
 
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