Probably when you entered the CoinMarket-Cap site and the page of each of those currencies, you see a phrase called circulating units that shows us a number. In fact, it means the number of units of that currency that is currently in the market and based on which a market cap is formed. If you multiply this number of circulating units by the current price, you will get the market cap number. Now what is the relation between these two?
Note that we can make analyzes based on the number of circulating units and the price for which the currency is forecast. By multiplying these two, we can see which market cap for a currency can be considered reasonably.
For each crypto currency, this number of circulating units is different.