CSPM 3.1 does not import PIX 6.3 config commands.
If you would like to use the new 6.3 features, you will have to use the epilogue feature.
So , to come back to your question, CSPM should be allright with 6.3
There won't be a new version of CSPM anymore , the product which replaces CSPM is VMS PIX MC.
hope this helps,
yatin