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 sb3 to sb2 conversion would be downgrade from version 3 to version 2, which should be doable with SB3 to SB2 Converter.
Home > Search converters: sb3 to sb2
Conversion of sb3 file format to sb2 file format beta
Search for sb3 to sb2 converter or software able to handle these file types.
Convert Scratch 3.0 project file to Scratch 2.0 project.
We have found 2 software records in our database eligible for .sb3 to .sb2 file format conversion.
Microsoft Windows software 
- convert sb3 to sb2 on Windows
SB3 to SB2 Converter
A Scratch file converter
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from sb3 file | No | No | No | No | No | Yes | No | No |
to sb2 file | No | No | No | No | No | No | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sb3 to sb2. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
On-line services software 
- convert sb3 to sb2 on web
Scratch
A programming language used to create interactive stories
Additional links: Open sb3 file, Open sb2 file
SB3
Files with sb3 extension can be pretty much always found as projects from the Scratch 3.0 development tool.
SB2
Files with sb2 extension can be typically found as projects from the Scratch 2.0 animation tool.
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