The short answer is yes. In TNG : Silicon Avatar the Crystalline Entity is described as functioning like...
...a giant electromagnetic collector. It needs a lot of power to keep
going... so it strips every form of life from the worlds it encounters
and converts it all into energy.
It follows that a being that was already composed of the right kind of energy could be freely ingested without the need to disintegrate it first.
Moving down the canon scale, we see precisely this situation in the TNG book "Orion's Hounds".
After encountering a colony of "branchers" (a local slang term for the Crystalline Entities), Captain Will Riker provides a race known as the Pa’haquel with a weapon based on the gravitic beam used in Silicon Avatar. He also attempts to feed them directly from the deflector array in the form of bio-energetic electromagnetic energy.
Ultimately, the Pa’haquel use the branchers to attack another set of creatures known as the cosmozoans, beings the size of solar systems largely comprised of energetic gases and capable of destroying entire civilisations.