They both require the same connections, however the original installation is badly installed because the earth wire is being used as a switched live. So there isn't an actual earth connection.
In the lid of your old 6060 there should be a wiring diagram which if I remember correctly will be.
Terminal 1 = Live
Terminal 2 = Neutral
Terminal 3 = Switched Live
Terminal 4 (not used in your application)
The new 6360 thermostat uses exactly the same configuration. If it does need an earth connection though, you have a problem. Check with the manufacturer's instructions. Even though there is an earth terminal provided, doesn't necessarily mean the thermostat needs an earth connection.