These are two different classification methods.
PVC stickers are classified according to the material on the back of the sticker, and self-adhesive stickers are classified according to the material of glue. Not the same concept, but some stickers can be PVC stickers or self-adhesive stickers.
Just like men and middle-aged people.
The difference between PVC sticker and pet sticker is that the material on the back of the sticker is different. PVC and PET are both the names of a material, that is, the material on the back of the sticker.
PVC is not environmentally friendly, low in price and easy to process.
PET is environmentally friendly, expensive and difficult to process.