I don't remember how X! works, but if you want all the same size you could as an alternate method create your shape the dimensions you want and then fill/bitmap. Then you can move the image up and down until you get what you want, you can't move left or right because the photo borders will show.
If you need to do multiple photos you should copy and save the shape for further use. Export the finished filled rectangle.
I am aware that this method may not give you the ability to crop the image exactly like you want it, but, it's just a thought.
What do the rest of you think? Is this a resonable method using X1?
Here is an example.
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