Is MySQL 5.0 MyISAM table format backward compatible with 4.1?

[mos]

I'm planning on installing MySQL 5.0 today and will try rebuilding some of 
the indexes for one of my tables to conduct some benchmarks. I will 
probably reboot back to MySQL 4.10 and continue using the database. Have 
the table formats changed from 4.10 to 5.0? Or can I create/modify tables 
in 5.0 and then use the same tables in 4.0?

Are there any speed improvements in 5.0 compared to 4.1?
TIA
Mike

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