There is quite a bit more overlap between WLLZ and WCSX than there is between WLLZ and WRIF.
WLLZ very barely touches any music made in the past 20 years, and like WCSX, its most commonly played decade is the 80s.
Perhaps due to WLLZ, WCSX over the past couple years has gradually added more hard rock to its playlist and even a select number of 90s songs to its playlist (they play 90s era Aerosmith a lot, and I've even heard Candlebox on WCSX on occasion. I've yet to hear Nirvana or Pearl Jam firsthand on CSX, though).