The basic instrument is the same. The set-up (bridge height, curve, string type) may be different. Many players of traditional music prefer a flatter bridge.

By the way - the (possible) reason why the habit of holding the bow a couple of inches up from the frog developed.

Compare the length of a modern bow, the average length of a baroque bow and the playing length of a modern bow held traditional style. Try it and see how it affects the feel of the bow.

(Unfortunately some 'classically' trained players are unable to make a baroque bow work for them. I have a problem in terminology because 'classical' also refers to a particular period, and someone who has learned the correct technique for that era will have no problem.)