If your existing tablet is using wireless N, a new tablet using wireles AX will be snappier and seem faster. But the router has to be providing wireless AX.
So maybe. Even if the router and the tablet support wireless AX, if there is a lot of interference from neighbors , you may not notice any difference. Wired will always be more reliable.
i don't know what the wireless router is providing. I don’t know what your existing tablet is using for wireless.
ipad9 is
Wi-Fi 5 (802.11ac) with 2x2 MIMO; speeds up to 866 Mbps
Ipad 10 is
Wi-Fi 6 (802.11ax) with 2x2 MIMO
Simultaneous dual band
should be roughly 2x wireless bandwidth as ipad9, all other things being equal.