Broken down gumby style..Everything I have received from wwc was about the same sg and alk. No matter when I ordered it.
Great thing about them, customer service. Call them in the morning and they will tell you what sg and alk the stuff is.
That's because I need to make sure they match mine, and I would do What if either was different? That means a slower drip acclimation to my tanks water while holding at the same temp?