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Merge PowerPoint Presentations Slide By Slide as Animation

I have 12 PowerPoint presentations (one for each month) with same number of slides and each slide contains similar reporting info/trends/tables for the corresponding month. I would like to merge all 12 of them into a single Presentation, with each slide contains 12 months of slidepack added as animations. Basically, this will help to show the trend month-by-month for the whole year.
Is it possible using some PowerPoint magic or using VBA? I have found a VBA macro that merges them into single one, but it merges file 1 + file 2 + …. + file 12 in sequential order.

Is there a way to keep same number of slides, but merge them slide by slide as animation? Below schematic shows what I am trying to achieve.

merge PowerPoint slides