You will probably need to break some of the heat-sink tabs off the sides of the switches in order to fit them side by side, but I dont think you would run into any problems. The heat sink tabs are not really used for the on/off (since it is just powering a relay), so breaking the tabs off wont cause any performance issues. Breaking tabs off the dimmer will reduce the maximum load, but should work just fine for 2x 60W bulbs. Assuming you only need to remove 3 of the tabs, I believe the limit is 500W on the dimmer.
The dimmers are not safe to use with fans, but according to this post, the black on/off should be able to power a fan up to 400W without issue.