To expand on the last post for beginners, with more specifics:
The best possible equivalent you could do is download and use the VST "C700" (in your DAW of choice) to automatically rip the individual wavelengths of each instrument/sound in the SPC file into their own samples. Most games for SNES kept all the samples for the entire game on each SPC so you only really need one per game, though there are some exceptions. If you don't think an instrument/sound is in an SPC when listening through the raw imported samples in C700, theres a very good chance Koji or some sound designer just went crazy manipulating one of those samples.
Unfortunately there currently isn't (and possibly never will be) a way to rip or automatically recreate the soundfont of each instrument, but by using SNES SPC700 Player you can see the pitch, pitch-bends, envelope, etc. of all 8 tracks in the SPC and thus recreate the soundfont for each individual instrument manually by using C700 (which emulates the music chip insides the SNES). Will definitely give you an appreciation for how hard they worked to make SNES music sound so good.
Rarely, you can download soundfonts for specific games that people have already created themselves. There are a few of these over at Zophar's Domain, they also have a bunch of tools for audio ripping and manipulation, as well as SPC files.