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Oh really? Think perhaps my knowledge on cracksets is a bit dated and generally deficient. I've always thought that standard vs compact involved different BCDs.
Ah yes, have just looked it up and ultegra uses 110 for all? OK, that is definitely good to know for pos switching to a compact down the line.
cowhead17
The short cage can happily handle 11-32. Shimano are very conservative on their specs.
Assuming the chainset is Shimano 6800 you don't need to replace the crank arms to switch between 53/39 and 50/34, just the rings.
There are no compatibility issues mixing 5800/6800/R7000/R8000 parts that I'm aware of*. They're mostly functionally identical but 105 level components are made using slightly cheaper processes that make them very slightly heavier.
(* Though I wouldn't use chainrings that don't match the crank arms)