Yes, but it is not recommended to do so. A rail EN pin has many features that logic GPO pins do not have, such as enable and disable with different dependencies, delays, fault responses, re-sequences, fault logging, and so forth. Fault shutdown with a rail is also faster than using an LGPO.
For more FAQ please check the following document.
UCD90xxx Family Frequently Asked Questions and Answers
UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U