If you really MUST How to set up Static IP Address shows how to do it.

You CAN NOT set 2 interfaces to have the same address. Again if you REALLY want to use the same static IP address for interfaces if only 1 is connected you can use a fallback See How to set up networking/WiFi but this is not a great idea - you would NEED to stop WiFi from connecting.

I feel obliged to point out that there is no NEED to set static IP addresses - I haven't done this since 1980, unless configuring a DHCP server. I don't know what the IP of my 7 Pi are, and don't care!

You can remove ip6 if you aren't using them - there is even less need for static ip6 addresses

If you really MUST How to set up Static IP Address shows how to do it.

You CAN NOT set 2 interfaces to have the same address. Again if you REALLY want to use the same static IP address for interfaces if only 1 is connected you can use a fallback See How to set up networking/WiFi but this is not a great idea - you would NEED to stop WiFi from connecting.

I feel obliged to point out that there is no NEED to set static IP addresses - I haven't done this since 1980, unless configuring a DHCP server. I don't know what the IP of my 7 Pi or 3 Macs or other devices are, and don't care - I access them by name, and make the routers do their job!

You can remove ip6 if you aren't using them - there is even less need for static ip6 addresses