The dimensions of the Toyota radios will be the same. If you had the optional CD player this would mount below the radio where a small glove compartment or something like this would be.
The radio faceplates do not interchange unless the radios are of the identical model. Thus make sure you can live with the faceplate color and design.
Does the radio have a remote or built-in amp? If a built-in amp how many of plug(s) on the harness. Toyota used single and two plug harness systems in these years of car. If you want the stereo to connect right up make sure the number of wiring harness plug(s) are the same. Look at the back of the radio for this.
The web site
www.installdr.com provides some info on the two-plug system.
If your setup has a single harness plug, you can buy a two-plug harness and splice it in. Have not seen a single plug harness offered but might be able to get one from a junkyard.
Make sure to check if the radio has theft protection. If the unit has a tape player there should be something written on the cassette door stating “Anti-Theft System”. If the radio has theft protection, make sure you get the code or the code was never set. If set, the radio will not turn on unless the code is punched in. The Toyota dealer can reset the code but may charge up to $80 to do this.
Although the stock radio and tape player looks better, the quality is not equal to a good aftermarket stereo. One issue is cassette tape drive wheels tend to crack and cause a clicking noise. The other is the display can wash out over time and be hard to read. Unfortunately the cost of repairs is more then the cost of a new aftermarket radio.