Yes, all imports are subject to duties and taxes as per the laws of the country.
CNF price is the prices of the unit along with freight charges, CIF price is unit price, freight charges and insurance charges.
Yes, the car can be identified by the chassis number.
There are no extra or hidden charges to be paid to Auction House Japan, but you have to pay the customs duty and taxes to the government of your country as per the laws.
Duty amount depends on the vehicle type, year of manufacture and fuel consumption. You can get an estimated duty amount by using the Tax Calculator at TRA's website: http://www.tra.go.tz/index.php/calculators-tools
24 to 34 Days through RORO shipment.