Merge a two courses with different story size

Hello! I'm currently struggling with the merge of two separate courses that have different story sizes. What's the best way for merging and that they look the same.  I have tried updating the sizes to match before merging (importing one course into the other one) but still, the slides of the first course look smaller than the slides from the second course once I merge them. Not sure if there is a solution for this? 

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