Is it possible to replace an existing crown without drilling into the prepped tooth underneath?

Hi:Yes the information you have been given is correct.  There will be slight preparation of the tooth under the crown.Best,Dr. Maddahi

To remove a crown, the crown is separated, usually into 2 pieces, and wiggled loose. It isn't necessary to drill into the tooth for that portion of the procedure. But your crown needs replacement for a reason; it's ill-fitting, has cavity under it, etc. If you have decay or irregular margins, that will need to be drilled.