Is there any difference?

I was looking for modules (this time for sd card module) on ebay and I found different names of arduino. E.g. Arduino UL Arduino SA Arduino G1CG Arduino AVR ARM Are these modules different or all of them will work fine?

Question 2: I want to store data every hour from sensor, then analyze it on PC. If the sd card is formated to Arduino (I read that it needs to be formated) then will it stay useable for PC?

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