There are some slight difference in batch, and there will be feel difference also between pcb and plate, and what plate material steel or aluminum. There is also at least 3 significant 'generation' of blue. I have some very old ones that the click part is black instead of white, these feel smoother than more recent version. I have a few board that have what I consider normal blue like on my Poker and 1813 which have a milky white click part like a clear stem. I also have some misc blue switch I got from someplace that has a very light blue stem, almost pastel, and these feel way different and much lighter and the click part is opaque more like white stem.