Your older Apple TV will work with the new Siri Remote
(iMore iPhone)

Best answer: Yes, the new Siri Remote will be backwards compatible with older models of the Apple TV 4K (2017) and even the Apple TV HD. It can be purchased separately starting on April 30, so you do not need to buy a new Apple TV 4K just to get the updated Siri Remote. What`s new with the Siri Remote? As we pointed out a few weeks ago, it was time for the Apple TV remote to die. The old remote was unintuitive for the average user with the heavy reliance on touch area gestures rather than actual buttons, and it was too easy to lose because of the small and thin design. The new Siri Remote changes all of that. It now features an innovative new clickpad control that has five-way navigation for better accuracy. However, if you prefer the touch-enabled gestures from the previous version of the remote, those are still available in the outer ring of the clickpad. Swiping on this outer ring also turns it into a jog control, making it even easier and faster to scrub through video and find...