Moulds wear. Early pressings can be far sharper and clearer than later ones.
If the textures look the same, just feel different, it will be the mould wearing. Best to check if the appearance of the textures between marked and unmarked are the same.

(Although there might be differences between the mould for the big ones and the smaller.)
Many are unmarked, and there were an awful lot made. I would doubt they have been copied.
Not that this is an area I know well,

the only famous copies of pressed Scandi glass I know of are the Timo Sarpaneva Festivo candlesticks. And if you know what they ought to look like, you can tell the difference.