Help with differences between 2 CZ27s

I have another set of pistols that I posted on another forum and decided to try posting some questions here. Just like the other post I had I was unable to get the pictures to transfer directly to this forum but the links do work. I apologize in advance for not being able to get the whole message here so please bear with me.

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30.16 KB I recently bought 2 nazi marked cz-27's and I have a few questions. I've been trying to find more information on these but haven't had much luck. I've been looking at both pistols and I have a few questions about the differences between the the two. In the enclosed pictures you can get an idea of what they look like. The top one is serial# 4275xx and the bottom one is 4280xx. Now these are only a little over 500 digits apart but have some minor differences. The top one has a blued trigger while the bottom is in the white and has a strawing to it.

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156.43 KB The top one has a blued barrel while the bottom one is in the white.

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151.8 KBThe saftey on the top one has more machine work done to the lever and button while the bottom one is a lot simpler.

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157.41 KB Both of these are not import marked and all matching. The top one has a stamp on the grip that looks like it says SXIX followed by what appears to be a sun. I was wondering what this mark was.

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23.79 KBAlso why are these so different when they are only a little over 500 digits apart? Is the bottom one original while the top one is a post war rework? Also there a some slight differnces between the grips. Any help here would be greatly appreciated.
Thanks,
Brad

PS
Was $140 a piece a good price for these?