jschance,
The basis for many of the Lyman/RCBS/SAECO/NEI etc bullet series is just that: The same cutting tool ("cherry") is used to cut shallower cavities to make a lighter bullet.
The Lyman .459" series Postel-type bullet molds for example, differ by one lube groove and driving band each to produce 385g, 460g, and 535g bullets. I can't imagine their tool makers grinding separate tools for each cavity.
You can easily modify your Lee 200 grain mold by milling off one base band and lube groove. This can be done on either a milling machine or a lathe. Or even on a large sanding machine, if you are carefull!