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MWI don't know of a 1930 Chicago Cubs Team issue but if you're referring to the 1931 Team Set, there are several main differences:
Size. The 1931 Team Cards are larger (6-1/8" x 9-1/2" vs. 5" x 7")
The Mount. The 1931 Team issue comes on a thin, sepia-toned paper stock whereas the 1930 Blue Ribbon Malt cards are often mounted on a gray cardboard backing very similar to the Hockey beehive issues (i.e., they are affixed with a small strip of glue near the top of the card).
Finally, I'm pretty sure, but not positive, that all of the player poses are different between the two sets. I no longer have any of the Blue Ribbon Malt cards after having sold them all to Larry Fritsch some years ago but I do have images of some of the key cards from the 1931 Team issue:
Kiki Cuyler
Gabby Hartnett
Rogers Hornsby
Ray Schalk
Hack Wilson