I was wondering whether objects serialized using CPython's cPickle are readable by using IronPython's cPickle; the objects in question do not require any modules outside of the built-ins that both Cpython and IronPython include.  Thank you!
It will work because when you unpickle objects during load() it will use the current definitions of whatever classes you have defined now, not back when the objects were pickled. 
IronPython is simply Python with the standard library implemented in C# so that everything emits IL. Both the CPython and the IronPython pickle modules have the same functionality, except one is implemented in C and the other in C#.
compatibility between CPython and IronPython cPickle