Leave your PS3 that's on 3.60 alone. The other one you get, **** keeping it on 3.41. Update it to the official 3.55 firmware, and then place a CFW on top of the original. There's no sense in having a CFW for 3.41 unless you're a dev of some sort, and giving you're asking this question, you're not one. So update the 3.41 OFW to the 3.55 OFW, and then stick a CFW 3.55 on top of that one. The data transfer question can be found here,
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Although the FIRST step tells you to download the latest firmware, ignore it. End of story, question answered.