This is a perfect example of the difficulty in describing sound and how the words we use may have a different meaning to someone else.
I know the sound of both preamps well and, to me, the sound of the Modulus is indeed what I would describe as “bleached” sounding; what I sometimes refer to as having a “gray” sound. HOWEVER, it is definitely not thin sounding. In fact, it is quite full sounding and with larger individual images than the CJ. I think some listeners associate the description “bleached” with being thin. “Bleached” is the absence of natural tonal color even when the sound is very full and not thin at all. To me, the CJ sounds more colorful the way that live music sounds and is actually a little thinner sounding, but not edgy or harsh at all.
Good luck with your choice. Both excellent preamps; each with different strengths.