Can you buy shinkansen base fare at a later time?

So I just bought my reserved seats for the shinkansen from Tokyo to Osaka at the ticket office and didn’t really think twice about how cheap the tickets were. I now realised I bought the express pass without paying for the base fare.

My question is, am I able to pay the base fare at a different time and use it for the tickets I already paid for? I’m concerned that I just wasted a lot of money.

Thanks!

by InternationalTrip136

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