Question on transaction fees when replacing a “pending” transaction

I tried googling this but didn’t find the answer.

I tried to swap ETH to a token on Uniswap and set a too low gas price. Transaction is stuck pending.

I read that you can replace this transaction by repeating the transaction but using the same nonce and a higher gas price.

My question is, in addition to having to pay the new gas fee, do I also lose the old one? Or will the old one be returned when the original transaction is replaced?

Appreciate the help!