Wow, NES collective must have woken up on the right side of the bed today. No one being toxic... yet.
All G19 mags work in every G19 generation. There are actually generations (different iterations) of G19 mags to complicate matters even further. This isn't my pic but reference below. They're G17 mags but G19 mags would look similar. Left to right are oldest to newest iterations of magazines. I think the newest iteration has an orange follower which may not be depicted.
The only thing you need to know is that U-notch are not drop free (aka NFML - not full metal lined). When fully loaded U-notch mags tend to bulge and need to be pulled out of the mag well. Square notch doesn't bulge as much so they drop free (FML - full metal lined). There are more nuances to all this but I'll save you the essay and suggest that you just buy what you can afford.