The ordinary glycolic acid fake or original?

The line colour is different

Both have the double-layer peel-back sticker

The left bottle has a thick, bright blue batch code (4JU2)

The right bottle has a thinner, black code (4JNN1L)

I have used both bottles. The second one (on the right) is finished and it seemed to work well for me.but I'm currently using the first one (on the left) and I can't tell if it's actually working or if it's the same formula