I don't know about USC specifically, but usually Online, Part-Time and EMBA programs are easier to get into.
For what it's worth, I just looked up USC on US News, and the 10th-90th GPA percentile for the Part-Time MBA program is 2.78-3.77, while for the Full-Time program it is 3.18-3.92. Similarly, the GMAT averages for the Part-Time and Full-Time programs are 632 and 708, respectively. There was no data available for the Online program.
I wish you the best! Cheers!