  We study the slope, intercept, and scatter of the color-magnitude and
color-mass relations for a sample of ten infrared red-sequence-selected
clusters at z ~ 1. The quiescent galaxies in these clusters formed the bulk of
their stars above z ~ 3 with an age spread {\Delta}t ~ 1 Gyr. We compare UVJ
color-color and spectroscopic-based galaxy selection techniques, and find a 15%
difference in the galaxy populations classified as quiescent by these methods.
We compare the color-magnitude relations from our red-sequence selected sample
with X-ray- and photometric- redshift-selected cluster samples of similar mass
and redshift. Within uncertainties, we are unable to detect any difference in
the ages and star formation histories of quiescent cluster members in clusters
selected by different methods, suggesting that the dominant quenching mechanism
is insensitive to cluster baryon partitioning at z ~ 1.
