Smart home router migration

Hello!

First post here.

I recently had a new 1Gbps up/down fiber connection installed in my house. Without going into too much detail, I need help migrating my settings from my previous mesh system to a hex S where the mesh system will act as wireless access points.

I have a Raspberry Pi running Home Assistant, which along with some other smart devices requires static IP addresses to function optimally.

Can I copy over the IP addresses, DHCP server and subnets from the old system and expect it to work with Home Assistant immediately?

There’s a small amount of static IP reservations in the old system, WiFi-bulbs & home assistant. I think these will be gone when I put the mesh into AP mode. If I just walk through each of the devices in RouterOS/DHCP/Leases & assign them to their old ip’s, same question as previous, can I expect it to work as before?

I know the Hex S will not be able to utilise all the ISPs bandwidth but it’s not of any importance at the moment. My wife hates visible technology & a side quest for this setup was getting everything as compact as possible.

The mesh system is 3 pc Tp-Link M4 & one X50 POE if it’s off any importance.

I searched for similar questions asked but I’m too much of a network noob to put 2 & 2 together.

Thanks in advance!