The CHAMBY name token symbol is better still, it's more unique. CHMB already has a trading token on Kucoin (CMC,CG), the development is still long but the choice of the original symbol is also important.
To be honest, I didn’t know that the CHMB ticker was already used by someone. But there are many ways to emphasize uniqueness. For example, you can use additional characters:
$CHMB
~CHMB
#CHMB
and so on. There are many similar tickers for the most popular combinations of letters, for example, IQ, BTC and others.