Dude, it's easy to find their differences. Potato Mine can only explode zombies in a single tile, meanwhile Primal Potato Mine can explode zombies in 3x3 tiles.
If they have high levels and you use plant food on each of them, Potato Mine will duplicate himself more than 2 clones, meanwhile Primal Potato Mine will duplicate himself only into 2 clones, but the clones have larger explosion radius.
Did you just change the difficulty in each Chinese worlds? Well, you wonder why Steam Ages has 5 jalapenos? Well, it's because that difficulty is actually in-game. If you wonder to know, the difficulty in-game doesn't even affect their specific worlds. So, those difficulty are actually the one in-game. Thank you for notice.
That is the hard mode difficulty. I mean by the normal difficulty. You wonder why there's 3 jalapenos? It's because you unlock several worlds first which include that world before you unlock other world. If you unlock Steam Ages lastly, it could have been 5 jalapenos. The difference between hard mode and normal mode is that hard mode has zapping purple border, meanwhile normal mode has white pure border. Hard mode is based on what world you unlock first, for example. If you unlock Steam Ages first, it could have been 1 jalapeno. Meanwhile, its original difficulty is 5 jalapenos (even though it's pathethically easy). And if you notice, hard mode has their jalapenos on fire.
Well 2 months ago it was more active because of the PvZ 10th birthday thing going on,so now I guess it'll be less active at least until we get news from the next game (possibly called Plants vs. Zombies: Battle for Neighborville)