Can I use a head unit from newer Toyota Hilux etc

[joell]

Toyota uses the same connectors across almost all the models (except with ampified JBL audio.) so I think a OEM hilux Toyota 200mm size unit will fit nice.

Now the funtions you are interested (BT and reverse camera) maybe no were planned for your car, and some wiring will be missing from the main harness (like de reverse wire in my car).

If the steering connectors are the same, probably is just plug & play and there is no need for a SW interface, for the reverse camera if you use a non oem model it will need a something like the MetraAX-TOYCAM adapter to add one to the new oem headunit for video and power supply.
like jcboy says: Better look at the back of the unit and compare to the connectors in your car.