You can usually only run one soundcard to one PC at a time, so you'll probably need one each. Most decent soundcards have a MIDI I/O, so just use that for syncing your sequencers together. You can then both use your controllers (Maschine, Push) to control your sequencers (that are now synced).
There are plenty of decently priced smaller soundcards you can use, both USB and FW. Like this one:
http://www.sweetwater.com/store/detail/Scarlett2i4/
Then you also have balanced outputs you can use for both in the studio & on stage.
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