What observation(s)--if any--confirm that the types & concentrations of energy, which are influenced by gravity, are the same ones that cause gravity?

Question

General relativity allows various forms of energy to participate in the gravitational force.

What observation(s)--if any--confirm general relativity's notion that the various types & concentrations of energy which are influenced by gravity (i.e. feel the effect of spacetime curves...sometimes referred to as "passive") are all the same types & concentrations that cause gravity (i.e. create spacetime curves...sometimes referred to as "active")?

I now provide links to a couple Physics StackExchange questions which arguably come close to answering the above, but don't quite answer it...with one answerer readily admitting he's unaware of any such observation(s), when it comes to light.

Thank you for your help.

Answer 1

1. Eötvos-type experiments establish that QCD binding energy is exactly equivalent to mass as far as feeling the effects of gravity.
2. Conservation of momentum is generically observed in all interactions in our universe.
3. given 1. and 2., if energy was NOT active mass, then the force that a pound of gold exerted on the Earth would be different than the mass that a pound of hydrogen exerted on the Earth. Since they FEEL the same force from the earth, you cannot have conservation of momentum as both of them fall, since they would exert different forces on the Earth
4. Therefore, if you believe that passive mass is different from active mass, you either have to disbelieve in conservation of momentum or the equivalence principle, both of which are exactly consistent with known experiment.