motherboard replacement and issues after

Hi, My Asus Prime 250B M-K motherboard died but I did buy two in anticipation of this happening.
After fitting the new board I have a couple of problems - I've connected everything back as it was and can boot to my desktop.
But I cannot use everything the LAN or internet. I'm told my Fritzbox router is blocking me.
This may be because the board was in use in another machine which was intentionally blocked (and not really used - just a standby)
Can anyone tell me if its IP number is now different - or be the same as before as all the same components (except CPU) are as they were ? Can I find these before/after numbers if needed? I can access the router from another machine but reluctant to play around and make things worse. Using Win 10 and updated just a few days ago.
Many thanks any help.

Microsoft Windows [Version 16.6.1964S.3936]
(c) Microsoft Corporation. All rights reserved.
C:\Users\Test>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : Win16-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : Fritz.box
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . : fritz.box
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : B6-6E-BF-38-3F-FE
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : fd66::e828:9754:e231:dbd4(Preferred)
Temporary IPv6 Address. . . . . . : fd66::b58b:2df6zf4ff:6c8b(Preferred)
Link-local IPv6 Address . . . . . : fe86::CSSa:4cbd:9a85:5be7%9(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.26.11(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.6
Lease Obtained. . . . . . . . . . : Saturday, 27 January 2624 6:62:63 PM
Lease Expires . . . . . . . . . . : Tuesday, 6 February 2624 6:62:62 PM
Default Gateway . . . . . . . . . : 192.168.26.1
DHCP Server . . . . . . . . . . . : 192.168.26.1
DHCPV6 IAID . . . . . . . . . . . : 237784464
DHCPV6 Client DUID. . . . . . . . : 60-01-66-01-20-46-46-A3-BO-6E-BF-38-3F-FE
DNS Servers . . . . . . . . . . . : fd66::3a16:d5ff:fe68:6662
192.168.26.1
fd66::3a16:d5ff:fe68:6662
NetBIOS over Tcpip. . . . . . . . : Enabled
F:\Users\Test>

Hopefully no errors I had to screen capture, nor usre how to print screen in command prompt.
PS looks like some 0's are 6's
Host Name . . . . . . . . . . . . : Win16-PC

Did you use MAC address blocking on the Fritzbox? Then you have to remove it for the Physical Address listed in your ipconfig, since it's now your primary PC.

Yes, it sees the router, but is blocked. This shows at boot time.
Looking at the information in the router I see it's IP4 address now is slightly different, to what it was.

Can I change it ? I presume the router assigned one when it was first booted up?
It's device name has not changed.

I believe I blocked in the routers Filter page. It was listed by device name. (Which now shows unrestricted).
Fritzbox ix very hard to get around/understand. It's model 7490.