The Capital Accounts setup for a sole proprietor is completely different from the setup for a shareholder corporation. For a start they are completely different legal entities.
If you are currently a sole proprietor and are converting to a corporation then you need to start a brand new Manager business from that date. The transactions within the sole proprietor business can’t become transactions within the corporation business.
The opening Capital Account in a corporation can only equal the valve of the issued shares and the Retained Earnings account would be zero as the corporation hasn’t traded until its first transaction which is not a Starting Balance.
The sole proprietor Capital Accounts - contributions, drawing, retained earning - do not become part of the corporation’s BS - Equity section. These values would become combined within a Shareholders Loan A/C, if applicable to the corporation’s Starting Balances.