How to transfer PC save data to switch?

[cfancc]

I was playing Another Crab's Treasure in PC for a long time, and want to continue playing on switch(cracked).But when I transfered the save data, I meet some problem:

1. First I open game on switch, waiting for an autosave, then backup game save data in JKSV,get game save file in switch.One file named Save1_SaveFile_0.CRAB
2. I find my save file on PC,named EF919A23BAF24269BD2E0B9E90AB63B4
3. I find some same structs in these two files,some info like JSON
4. copy file content in EF919A23BAF24269BD2E0B9E90AB63B4 to Save1_SaveFile_0.CRAB, and replace the JSON string,but keep the start unknow charactors and end null charactors
5. restore Save1_SaveFile_0.CRAB to game in JKSV

But when I opened game on switch, their's no save file found.I guess it was because the unknow charactors and also end null.I did some research but can't find out how these charactors generates.
1. Switch savefile is 693,589 Bytes, if JSON string not big enough, it will fill with null(0x00)
2. Switch savefile starts with three unknow character,when JSON string length changed,it may changed,but can't find fixed offset

Can anyone help me with these?