My DD (same age as your DS) is completely different to our friend's DS (age 3). It is so funny really as they boh have become very girly (DD) and very boyish (friend's DS).
DD is very independent, wants to make decsions, do her thing. Friend's DS isn't so bothered and will go with the flow.
Both are very loving and cuddly.
DD will have temper tantrums and take herself off to her room in a strop. But cmes round shortly. Friend's DS gets very whiney.
DD is into dolls, kitchens, dressing up, playing house, Happy Land type toys. Friend's DS is into fixing things and seeing what things do. He is obsessed by cars and keys.
DD is more confident on rides, playground stuff than friend's DS though/ Maybe to do with her going to Tumble Tots from being very young though???
DD adores pinks and lilacs. Friend's DS only wans blues and greens.
DD loves playing with other children, both older and younger. particularly, with her girl friends she chatters away, and actually interacts fully in games with the other child. Friend's DS will play along side other children and talks to them, but I wouldn't say he actually interacts as fully IYKWIM.
DD loves singing and dancing (and talking non stop) to anyone, or anything. Friends DS, whilst talks very well, is much quieter. He prefers examining things himself to chatting about them.
The colour and toy think is interesting as both have had access to all manner of toys in their on home, friend's homes and at nurseries. Yet their toys/games of preference are very gender specific.