How can I get the cabinet top to match the rest?

A photo usually can’t tell you exactly what finish is on there, especially with age and lighting changing the color. Try any cleaning or finish tests in a hidden spot first, and make a few samples on scrap wood that’s similar to the cabinet. Compare both the color and sheen in the same light.

I wouldn’t assume it’s epoxy. Furniture finishes can include lacquer, varnish, or tougher sprayed coatings, and they don’t all behave the same when recoated. If you can identify the existing finish, that helps. If not, test whether your proposed finish adheres and looks right on a small, hidden area before doing the top.

Check whether the top is veneer before sanding. If it is, aggressive sanding can go through the thin surface layer quickly. Stripping may be a better route, but test the stripper in an inconspicuous spot too, since products can affect the wood or old finish. Matching only the top can still be tricky if the rest has changed color over time.