E.K.
My daughters are 2yrs 3months apart (now almost 6yrs old and 3.5yrs old). I'm not sure if you have to worry too much (unless your 2yr old can pick up a Tonka truck and throw it up and in). We had a few sessions of my older daughter wanting to "share" a stuffed animal and such but it was never a real issue. What did end up being a issue with room sharing was that neither would sleep through the others noise. Neither of my girls appeared to be light sleepers until we moved my youngest into the same room, then every slight wimper, cough, ect... woke the other. We finally, after almost a year, had to move them to separate rooms (in our case we converted our computer room). Then they were like that for a year and shortly after my youngers daughters 2nd birthday we decided to try it again. They are now happily sharing the room in a bunkbed.
You really won't know until you try.
E.