As good of a idea as it is... Technically yes. As in, it's impossible. Currently, anyway.
You see both Cals version and the "classic" version have the same internal file name. And due to this you can't add them both because Forge prevents you from adding more the one version of a mod to your install. This is intended to prevent idiotic crashes which would be hard to track(I think) but it prevents the two mods from being used together.
If either one of them changed the internal file name for the mod then you can.
As for which version I use? Cal's version. Why? Because I hate searching for limited resources to power a power intensive device.
That being said, what was that about using a Compact Cell to run the system off of EU?