Yeah, I was waiting for CL to go on sale, so I'll snag it too.
I was going to get the S-type comp but I noticed I already had it

.
I went from 8.5.3 -> X1 (base) -> X2 ...I didn't think the S-comp came with X1 base (or X2 for that matter).
Since the U-type fires up in the channel on a new track - when you go and add another module, S-type doesn't show up.
(that's understandable since ~normally~ you don't have 2 comps on a track).
However, when I delete the U-type from the PC, then add a module, both U & S channel comps show up as options.
...as does the Replace Module - can swap them out.
Obviously I missed something as I was enjoying the scenery whilst on the upgrade path....