Hi Daniel.
You cannot currently change which OID a parameter element is pointing to in a DashBoard panel.
However, depending on what you're trying to do, there may be a workaround with a virtual parameter and ogScript.
That is, if I have ParamA and ParamB that I need to control and switch between. I could create a third parameter ParamC and pass its changes along to either ParamA or B (or A AND B depending on which one(s) should be updated).
If you explain your use a bit more, I may be able to assist further.
#DashBoard