It is probably not about saving 30€ on the smaller door leaf for the OP if he/she does not want an 88.5 door. I assume the 88.5 door does not fit into the concept or floor plan.
The OP probably isn't concerned about saving 30€ for the smaller door leaf if he/she doesn't want the 88.5 cm door.
I assume the 88.5 cm door doesn't fit into the concept or floor plan.
That may be. However, I can hardly imagine many situations where the additional 12.5 cm wouldn't be possible at all. It's certainly not a bad idea in principle to avoid a narrow door for the utility room either.