New 4K TV with my old fire stick?

I had an old flat screen with a fire stick. My son bought me a new 4K with built in fire stick. I’m a sideloader of the IPTV apps. I plugged in my fire stick. Do I need to do this or is the built in one good to use?

need to find out what version is on tv

I just disconnected my fire stick. It wasn’t in my settings. Thank you for your help!!

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