Score: Select export range

I want to save selections of different scores and import the images in another program. If the selections don’t have exactly the same size the results look bad (unless I spend a lot of time …). I haven’t found a way to manually set the size of the selection to avoid that.
Any suggestions or tricks?

How about selecting the entire page for export and editing the image in a separate app?

Thanks for the reply, SteveInChicago.
I had hoped that somebody found an alternative to that, like importing an ‘open’ rectangle (3 sides only) to be put around the range …