Your lilac piece is part of the same range as all those pieces with prunts, which is probably Kralik. I've also seen green and cream pieces.
Kralik glass was hand-made (though in a factory); there are bound to be variations and small flaws. These were also not premium ranges, so the standard won't be as high as perhaps some scarcer pieces. Quality control standards weren't so high 100 or so years ago: discards mean waste, which costs money, and the workers were almost certainly on piece work. These are not features of Kralik particularly but of all antique and vintage hand-made or hand finished glass. It is only now that we demand perfection from hand-made items such as those produced by Dartington. (Dartington wine glasses, though hand-made, have their stems pulled by a computer-controlled machine!!)