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maybe yes to all accounts :)
Dating from the late previous century;) the soundfont specification is a multi-timbral one which means that you can set or map presets to MIDI channels on a one-to-one basis; each preset, patch or or instrument if you wish to call that either way, is addressed by its corresponding MIDI channel, address or slot (1-16); each slot or preset, mapped on a particular MIDI channel there is, may be changed on the wire by a MIDI program_change message (PC#) or via Qsynth's GUI Channels > Edit... (button or right-click context menu).
From your MPK25 (which btw. I do also have one specimen:)) you can either change the current MIDI channel setting or else try the "Program Change" command to, yes, change the instrument preset/patch which is to be active on the MIDI channel setting there is.
hth.
cheers