Sure.
Use Replace With
Keyboard shortcut OPTION /
I think it’s COMMAND OPTION / (the same as in After Effects, incidentally) in versions prior to R15.
I tested it on a spline text object with an extrusion featuring fillet caps. Did a Replace With on the spline and voila!
From the R15 Manual
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Use this command to replace an object, or parts of an object (such as tags, User Data and so on…) with another one. Simply select the object to replace, then run the command to enter a pick session and select the object that will replace it. During the pick session, the object can be selected either in the viewport or in the Object Manager.
This command can be used on a variety of tasks, as it will not only replace an object entirely, but can be made to replace just the name, the object type, the parameters, etc. of an object by those of another one.
Options
Note that the Options pop-up (when called up via a hotkey) can be activated every time you run the command if you enable Options mode for the command, in the Window / Customization / Customize Commands Manager.
Tip:
When more than one object is selected, it will enter a multi-pick session when running the Replace With command. A multi-pick session allows you to pick one or several objects to be used as replacements. Ctrl/Cmd and Shift are used to add or remove to the selection of objects, and hitting Enter will confirm your selection.
If only one object is picked, then this object will be used for the replacement. If more than one object is selected, the replacement order will be based on the selection order, both before activating the command and during the multi-pick session (first object selected to be replaced will be switched with the first selected object during the multipick session, and so on).
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The only thing I don’t know is since this is in the character menu whether it applies to all versions of C4D. I don’t have a non-Studio version to test that.
I HIGHLY recommend enabling the Options menu.
– JC