Here are a few other examples for comparison, the three bottles in the first picture appear to have been produced from the same mould, with the texture matching across all three examples with their width/depth also being uniform. Please note that this is an old picture and the bottles are not lined up in the same direction.
The second picture shows a couple of early examples (again not with their texture aligned in the photo). On close inspection, the moulded texture on both of these bottles match, they also match the texture on the three bottles shown in the first picture. However, whilst both bottles are the same depth, their widths are different, so this would seem to indicate some degree of flexibility with at least one side of the mould used.