HA and two KNX IP devices

1

I want to connect two two KNX IP devices to one HA. It’s possible?

2

No.
You may use routing to connect 2 projects.

Unless you mean 2 actual Knx Ip Devices (Sharing a project). Then you can just use routing to talk to both.

So 2 Tunnel connections: no
2 Devices via routing: yes