Yes, there is a differnce, some of them are Green and some of them are Brown! In all seriousness, If thats all you have then fine as Ive done that quite a bit when i first started but now I have such an abundance of these free bottles that I can almost always pull out 30 of almost exactly the same bottles and if not I find out how many Im short and call my transfer station(dump) and ask them to save me some more. I call them on Sat. morning and go down at 2:30 right before they close and they usually have about 120 bottles which I have to sort through and get rid of around 15 screw tops and then either take them all home or just pick out what I want and toss the rest and then throw the guy a few bottles of wine and he is delighted.