Interesting thread!
The 2EQ has been the same since the Pre-EB days. The 3EQ sounds different because it has a high pass filter which favors the higher frequencies over the lows. Both are 9 volt They ceased being offered as from 2018 except for both the "Classic Series" 2EQ and the "Old Smoothie" black epoxied 2EQ Sting Rays which, in turn, ceased being offered as from 2020. Both are great Basses
All Sting Rays ("Special" Series) now have a new revoiced 18 volt 3EQ. The pickups are Neodymium as opposed to the previous Alnico.
I don't know what the future holds for the 2EQ as its IC chip has ceased being manufactured but there are equivalent ICs.