The former is before the spelling reform, whereas the latter is after. Or at least, I'm pretty sure that's the case. I believe it used to be that you couldn't use 'ss' at the end of word, even after a short vowel, and you had to use 'ß' instead. But that was ambiguous, so they changed it.
Check in a newer dictionary, the rules changed in the last 10 years, in some cases you can still use scharfeses (I hope I wrote it right) and everybody will understand it, but it might not be grammatically correct anymore.
Answers & Comments
Verified answer
The former is before the spelling reform, whereas the latter is after. Or at least, I'm pretty sure that's the case. I believe it used to be that you couldn't use 'ss' at the end of word, even after a short vowel, and you had to use 'ß' instead. But that was ambiguous, so they changed it.
Check in a newer dictionary, the rules changed in the last 10 years, in some cases you can still use scharfeses (I hope I wrote it right) and everybody will understand it, but it might not be grammatically correct anymore.
i think it's the same