You are correct. You can combine the payments without a penalty.
The IRS says;
"Besides the April 15 estimated tax payment previously extended, today’s notice also extends relief to estimated tax payments due June 15, 2020.
This means that any individual or corporation that has a quarterly estimated tax payment due on or after April 1, 2020, and before July 15, 2020, can wait until July 15 to make that payment, without penalty."
Estimated Tax Payments
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