Yup -
Yes they provide C class prices on some flights operated by City Hopper aircraft. There is no divider. The C-class seats have red headrest covers and the Y-class seats have blue covers. There is no difference in the seats, and not much for the meals either.
Copy and paste from my reservation below
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AIR - Wednesday, October 25
KLM Royal Dutch Flight 1964 Business
Operated by KLM CITYHOPPER
From:
Zurich Airport
2015 hrs, Wednesday, October 25
Unspecified Terminal
Equipment:
Fokker 100
Duration:
1 hour and 40 minutes
Meals:
MEAL
Status:
Confirmed
To:
Amsterdam-Schiphol Airport
2155 hrs, Wednesday, October 25
Unspecified Terminal
Seats:
7A
NAME Confirmed
YOUR FLIGHT NUMBER IS KL1964