Newer Breckwell Lower Auger Bushing vs Old bronze Bushing? Any Comments?

Hello
I just discovered a lower auger bushing from a P22 FS pellet stove with the 1/2" diameter bushing that is much more shinny and a different color meaning it is definetly different from their old bushing.
Top bushing is the same shinny stuff too!
Looks like the older bushing has more copper in it which is more costly.
Is it cheaper to manufacture? Probably
Is it any better?

Pic 1-2 show old bushing on left and new bushing on right with and without the camera flash.

 

Hard to tell,but looks like aluminum-bronze,which is much stronger,and more expensive.

 

If it is Aluminum-bronze then I have no data on longevity in a pellet stove.. Still it would be hard to believe Breckwell is spending MORE money in making their stoves????
However, there was a lot of sawdust leaking under it so it had to be changed. Stove does not look to old but I did not see an MFD under the hopper lid on the info tag??

Looks like copper may be better for pellet stoves!
Here is some info
Why did copper become more expensive than aluminum?

Excerpt
Copper provides a Lower coefficient of expansion and higher tensile strength!!



See sawdust in pic