Meat is resource intensive and certainly more resource intensive than eating vegetables directly. Meat is so inefficient that we grow most of our crops to feed meat, for example.
Why is this difference presumably not an ethical concern for you, but it is with lab-grown meat?
Differentiating on energy intensiveness sounds like an empirical claim, so I'm going to ask about the empirics.
You can't eat grass, and most ungulates can. If you're concerned about your personal footprint, it's not hard (in the US) to buy locally-raised, small-farm grass-fed beef.