Difference in South Galaxy G1 and New Galaxy G1

I bought a G1 system last year and it works great, it picks up between 15-20 satellites and has a SMA connection on the antenna and the top of the receiver is gray.
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I recently purchased a “New Galaxy G1” with the TNC antenna and black top, it picks up 20-30 satellites and works even better.
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My question is what is the difference in the two units? Do they have different antennas internally or does one have more channels than the other. I just cannot find a manual for the older G1 with the SMA antenna.

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