As far as I know both are natural dessicated thryoid made from pig thyroid. So the only thing that could really be different is the buffers and fillers in the pill itself.
Some people CAN be sensitive to certain fillers and binders etc. So it could be worth a try.
However the trembling, is that the only symptom you have. I think if you become over medicated and thus "hyper" it would cause many people to act as if they have too much caffine and that causes trembling in a lot of people.
So if you have racing heart rate, sweating or over hot and trouble sleeping etc you may be getting too much T3 in the Armour being over medicated.
If you are dinking a lot of coffee or soda with caffine that could be part of it as well.
Just things to consider.
I can tell you I switch from Armour to Nature because I am a cheapskate. The co pay is 25 bucks cheaper. My numbers when the wrong way, so I am back on Armour and feel much better!
of course like they say every case is like a snow flake everyone is different. I take 2 grains of Armour!
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I am sure it would not make a difference. What dosage are you on and what are your Free T3 and Free T4 levels? Are you taking any other meds or supplements?