How Long are the True Flight full length feathers compared to the AMG?

Can you get 2 4" feathers out of them?

No idea, but Trueflight have always been the best quality.

Just searched their website and it say approximately 11" long that should do it, thanks.

I expect they're close to the same length.  However, both are probably shorter than those offered 10 or more years ago.  Turkey feathers offered for fletching are getting shorter because the poultry industry is now growing the birds so fast and butchering them so young, the birds don't have time to grow feathers as long as they used to. Sounds weird, but true.