Both .sb3 and .sb2 file are from Scratch, so if any software can re-save one to another, it would be this software. It seems that this is a case of saving older file to more modern version, which should be doable with latest version of Scratch.
Home > Search converters: sb2 to sb3
Conversion of sb2 file format to sb3 file format beta
Search for sb2 to sb3 converter or software able to handle these file types.
Convert Scratch 2.0 project to Scratch 3.0 project file.
We have found one software suitable in our database for this conversion.
On-line services software 
- convert sb2 to sb3 on web
Scratch
A programming language used to create interactive stories
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from sb2 file | No | Yes | Yes | sb2 editor | Yes | No | No | No |
to sb3 file | No | Yes | Yes | sb3 editor | Yes | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open sb2 file, Open sb3 file
SB2
Files with sb2 extension can be typically found as projects from the Scratch 2.0 animation tool.
SB3
Files with sb3 extension can be pretty much always found as projects from the Scratch 3.0 development tool.
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