It uses its own bale.xml files (I also have some additional mods that are pending with MH I plan to post here that have the same capacities).
Let me know what you think! This is my first mod :) I submitted it to MH on Dec 2nd but it is still pending so I figured I would post here too for people to start playing with. I am 99% the current version will be rejected (no German translations) so I already have an "update" waiting with translations.
At the moment, it does not support "Unload Early", however it is on my list of things to add with the first full update.
With this pack, all the balers function the same as the base game just a little faster and the custom bale capacities.
My other baler mod (Lizard ProBale), I got more into the special options like additional bale sizes, custom pickup widths and early unload.