Not true, that's been debunked by YMS recently.
Not to mention, there are actually multiple Kimba movies and TV shows actually.
Please watch this video.
m.youtube.com/watch?v=G5B1mIfQ…I know this is kinda long, but it's a very interesting, and well done documentary of the long running fan-allegations, (and even Tezuka productions doesn't agree with them, hence why they never sued) and does great comparisons between both Kimba and the Lion King.
I highly recommend watching it, before you continue spreading that "Lion King ripped off Kimba" false rumor that has plagued the internet for decades.