Hi, I fear I know the answer to this question, but I am wondering whether there is any way to somehow link two separate wireless networks?

I am asking because I have had an Orbi system for a few years, but despite intense tweaking and troubleshooting the speed of the network has dropped dramatically. I have therefore just recently installed an Orbi 6 system in parallel (I know this is not recommended, but by using different channels there seems to be no interference and the Eero network is very fast). The two networks have different "third-position ip addresses" (192.168.x.n vs 192.168.y.n).

The only downside is that when keeping my phone/tablet on the Eero network and leaving my IoT devices on the Orbi network, there are some issues where I cannot access all devices/warnings about devices on different networks.

So my question is, is there any way to set up some conduit between these two networks in the house, so that devices see one another across the networks?