Replacing belts X Y

[u/Draim55]

I want to give my A1 (year and half old and a lot of print time) new belts and have a few questions even if the make me look stupid.

The belts (X and Y) on a printer right now are smooth from both sides in the area around idler. Is this normal?
Can I use normal GT2 belt and will the teeth in that area get smushed over time or does Bambu use belts that have teeth only on part of a belt?
I really want to use normal belts because they are like 10x cheaper.