Yes, they work for system 11 but you have to be careful that you understand the wiring differences, as Chris outlines in his link above.

If I have time this weekend, I will post installed pics on Sorcerer (system 9), and system 11: Pinbot, High Speed, and F-14.

My first system 11 install was on f14 tomcat. I didn't think there was enough room for that board next to the mpu so I used a z-connector and a longer harness to reach the sidewall. I also prefer to use larger wire for the flipper power wires.

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I decided I didn't like the extra connector and longer harness, so for the rest of the system 11 installs I crammed the little board next to the mpu. Its tight, but it works. Here is a high speed (the mpu is currently on the bench)

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Here is pinbot

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Here is sorcerer (system 9)

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These are not required on any game, but they are damn good insurance against the special solenoids getting locked on and burning up your mpu or driver board (depending on the system). Unless you planted a mpu tree or money tree in the backyard, I suggest you protect your very hard to find working system 9 mpu with a $30 fuse board.

HS pic is harder to see, but it's the same as the pinbot pic.