Will a 1998 accord transmission fit a 2000 accord?

It will but you have to be sure, if its a v6 to get a v6 too, if its a 4 cylinder you have more options, you can go with a 98 to 02 transmission, If you have no luck finding one you can go with a Prelude transmisson.

Here are some codes you can use in your research:

F23 = 98-02 4 cylinder Accord

H22/H23 = US and Japan Prelude

F20B = European Accord SIR

J30 = US 98-02 6 cylinder Accord

All F and H series motors and transmissons are interchangable.

Good luck.