I had a similar experience recently, buying C80L and C150L. The former had a darker appearance than the latter. I asked the LHBS proprietor and he acknowledged this, but reassured me. I've used them both in my brews and all has been as predicted colorwise. Go figure.
I contacted Morebeer about this and they assured me that the bag labeled C60 is in fact C60, though I don't know how they can be so certain since the people I spoke with are not the ones who packaged it.
I used the C60 and the beer turned out much darker than it should've and has a taste that you would attribute to using a much darker crystal.
I sent this picture to Morebeer several weeks ago and again explained what I was experiencing but never heard anything back.