No the tin doesn't matter, I've bought the same mixtures in both tin and bulk and I find the tins to be better. I know it sounds dumb, but bulk generally comes more on the dry side and more bitey
I generally buy more in tins than bulk, I just find the quality of the mixture is better in tins that bulk. And I have a lot of bulk tobacco, but the consistency is higher In tins imo
I have a very similar 673, ( looks exactly the same) it's a great smoker that I generally reserve for Fridays or vacations. Don't expect that red around the rim to stay. It goes pretty quick