If I don’t have Swiss Travel pass, can I pay the difference at the Gornergrat Mountain?

I bought 4 days Swiss travel pass flex online. And I also bought a Mount Gornergrat Mountain Peak ticket with Swiss travel pass online. Now, I realize I might use my 4 days Swiss Travel Pass up before I reach Zermatt, Switzerland. If I don’t have Swiss Travel pass, can I pay the difference at the Gornergrat Mountain?
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