Question about Giroflex Net back 353

Unfortunately, the Giroflex 353 Comfort III I asked about no longer seems to be available in the Galaxus range. The biggest difference I noticed are the castors. Here, the castors are hard floor castors, whereas the Giroflex Comfort III has universal castors.

Also, the entire lower part of the chair is made of a different material. Apart from that, I couldn't notice any big differences.