If what you mean by interchangable is that it will fit an fire...
The answer is a probable yes. The sideplate is one of the many parts that should be fitted to the frame for a solid fit, but in general (and I don't mean General DWM Ted!), the sideplate should fit well enough to function. If it doesn't, and it came from another one of you guns, don't modify it to fit... Get a diffent sideplate to fit on to your shooter.
Tom Heller can probably fix you up with a sideplate of the correct manufacturer, or a new production replacement, if you need to fit one. If your old one is not in bad shape he will probably even give you something in trade...
If you do a search on sideplate, you will find a thread with a couple of graphics on the areas that need to be fitted.
-John
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