Microsoft Speech Recognizer 6.1

Question

We have a Speech application written in C# which uses Microsoft Speech Recognizer 5.1. We are planning to use Recognizer 6.1 for better accuracy. I have few questions around this migration.

1. Can I move my existing 5.1 profile to 6.1 without going through the training again?
2. We see that the number of files generated by 6.1 are either 2 or 4. Is this completely variable? Will there be a case where the number of files is more than 4?
3. Will the files get updated when the sapisrvr.exe is running?

Thanks in advance,