Do all of them need to be replaced? Also depends on if you want them all to match.
You should be able to because they are basically same cars (on mechanical level).
Put it on jack and take the tires off then search on internet
If your 1991 Toyota Camry is vibrating, the tires might be wearing unevenly. This could be due to parts that are worn in the front end or even from tires that are damaged.
The Toyota Camry LE uses (a) 195 70 14 or (b) 205 65 15
Check near the tires.
195 70R14
The tires are 195/65 R-15.
My 1995 Toyota Camry LE (4 Cyl) Wagon has 195/70/R14 tires
The stock tires are 215/60/16.
The tire size is on the tire itself. Example : 175R14. Its located on the sidewall of the tire facing you. Check the size on both. if they match, then yes. If not, then no.
Yes, they are. But you will have use different sets of tires, of course.
Tires out of balance, bent wheel, or worn suspension parts.