FC1/FC3/FC4 e2fs compatibility

["Gene C." <czar czarc net>]

I recently noticed that e2fsck running on a FC1 system would not run against a 
partition created under FC3.  If I rebuilt the e2fsprogs package from FC3 on 
FC1, that would work.

So my question:

Assume that selinux is disabled, are there any problems accessing partitions 
created and used by a FC1, FC2 or FC4(rawhide) system with another FC1, FC3 
or FC4 system.  Would everything be OK?  Would anything be corrupted?
-- 
Gene