The difference between tokpie.com and tokpie.io is simple.
To trade, you need to register only on tokpie.com (exchange platform).
But, in order to get your referral link and/or pass KYC (only for withdrawals above $250000), you need to register on tokpie.io (cabinet).
Also, please note that your login and password from tokpie.io are not working when you try to login to tokpie.com. For security reasons they are separate servers. So, you need to sign up tokpie.com to start trading.