Finishing advice for window sills

[Pnw painter]

I'm finishing some Beech window sills and I'm attempting to match the built-in cabinets done by a local prefinisher. The prefinisher gave me a gallon of the stain they used for the cabinets, but that's all the info I have at the moment.

At this point I'm trying to figure out what products and process I should use for these sills? I'm guessing they used lacquer for the cabinets, so I was thinking about using SW high-Bild Precat Lacquer, but I'm not sure what sanding sealer to use if I use this product.

Any advice, guidance, etc... would be helpful. Basically, what would you do if you were in my shoes?

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[Klemm]

I'm not a professional painter but I have learned to do a test/trial on other than the "live" workpiece on any task/procedure/process that I have not done before.
-saves a lot of stress and that hateful "rework" [smile]

Hans