Yes you can. I often split my snacks, especially in the morning. As long as you dont go over your calories thats fine. I sometimes even add mine together if I fancy an ice cream or something!
Yep as long as you stick to 300 snack calories a day, use them up as you want to. Like this morning I've just had an apple for my snack, so may have an extra little snack later, or a bit more in another one of my snacks.