May seem like a daft question but I have 2 rolls of wallpaper with the same batch number, however, I have another roll with a different batch number as the wallpaper in question has now gone out of stock at the retailer where I purchased it from & if I need more will probably only get more on eBay with further different batch numbers. The pattern is a brick pattern in a natural off white colour. How important is is that all the rolls need to be the same batch numbers? I wouldn't be wallpapering the entire room, possibly only one wall, but a large wall at that.