The WLAN of the IB3 and IB5pro is relatively identical, except that Wifi7 is available (only useful for end devices that also support Wifi7) and that the 6 GHz band is also used. The transmission power is regulated by law and, if you have not reduced the power in the WEB GUI, is at maximum.
I bet that the “WLAN” problems are actually completely different problems. But you would have to know what the problem is. WLAN is not good, doesn’t really help.